We have discussed the issue with Business Support.
(Bug reference: ECOINT-6363. The original bug for Illustrator is linked to it, AI-4263218.)
We are now hoping for a speedy fix from the devs.
That such a folder is in appdata/roaming instead of local is another point that is a nogo in the business environment.

I think they fixed the bug in the latest version 26.4.1
Seems to work fine on our end. It still creates the folder but now it doesn't fill it with millions of empty sub-folders.

Can some of you check and report if its also fixed for you?

解決はしませんが、
macの場合、下記ディレクトリの削除でログファイルの増殖を抑制できます。
/Users/〈Users name〉/Library/Caches/com.adobe.illustrator/

Illustratorの起動前に必ずキャッシュファイルを空にするプログラムを走らせれば、
一応問題は発生しなくなります。

macOS 12.4
AI 25.4.6

Bug is still not fixed in version 26.3.

Still not fixed as of Mar 31 2022

This is still not fixed took down my server again today where are roaming profiles live. Adobe doesn't listen nor do they care. They'll tell you they do not support networks. Like we al like on an island. So dam mad.

The bug is still present in the most recent illustrator version 26.0.3. Unbeknownst to us filled up our server with terabytes of useless logs and consequently bringing down the whole user environment. It is taking days to delete.

This bug is still there, it has NOT been corrected in version 26.0.2, creates millions of directories and files on startup on Windows 10

This bug is still here. It creates millions of directory, broke windows search index, filled up backup catalog database.
We are redirecting the roaming profile to a server location, Illustrator is the only application that has problems with that.
Please fix!!!

This is BS in typical Adobe fashion. We are a firm of only 85 employees and I am dealing with over 900,000 empty log files in com.adobe.dunamis. You may say whatever they are 0 bytes but I have other functions that need to search the network like anti-virus and large file search and those utilities are be inundated unnecessarily by 900,000 empty folders. Adobe fix your Sh!t. At what we pay for subscription are you serious?

We do not have the pre-release installed we actually have the full 26.0.2 installed.

Update - completely uninstalled Creative Cloud, Illustrator, etc. Restarted computer and reinstalled fresh download. Same issue.

Also notice - it won't close. Hangs and have to force close.

I am having the same issue. V26.0.1(64-bit) / Win10 V21H1
Computer crashed today due to hard drive full.
Deleted (was 190GB)- C:\Users\username\AppData\Local\Temp\Adobe\com.adobe.dunamis
Opened Illustrator - dunamis***.log growing by the second - no files open only illustrator
3 minutes running - 2 files @102,900KB, 3rd file growing
Tried running "As Administrator" same results

Version 26.0.1 AND version 26.0.0 doesn't show up after executing them.
The process is there, but the program isn't.

Version 25.4.1 generates more than 10 million folders in less than 4 hours of work

Older versions doesn't show up on the link that is provided in the Creative Cloud app.

1. OS: WinServ2019 1809 (17763.2268)
2. 26.0.1, 26.0.0 and 25.4.1
3. With 26.0.1 and 26.0.0:
- Open Illustrator from Creative Cloud
OR
- Open Illustrator from an .ai file
OR
- Open Illustrator from it's own path C:\Program Files\Adobe\Adobe Illustrator 2022\Support Files\Contents\Windows\Illustrator.exe

4. Expected result with 26.0.1 and 26.0.0: Program working
Actual result: Process started (I can see it from task manager) but nothing happens. the program isn't there.

-------------------------------

3. Version 25.4.1
- Open the program

4. Version 25.4.1
Expected result: The program works
Actual result: The program works BUT it starts generating millions of folders in %AppData%\com.adobe.dunamis\id\v1 called 0, 1, 00, 01, 000, etc

------
Other tests:
Version 26.0.0 and 26.0.1
I tried using it with my domain admin acc and works.

Version 26.0.1, 26.0.0 and 25.4.1
All of them generates more than 10 million folders if Illustrator is executed from the normal user (the one who has to use it)

Notes:
User profiles are all in the same directory with RoamingProfiles and "creator owner" Total Control of it's own profile folder

GPOs applied are the same in the user and the domain admin account (i even disabled inheritance to be sure all GPOs were the same)

Profile folder is in a different server than the server the user is connected to (so, the one with Illustrator)

This just also crashed my system, zero bytes free in Windows 11. If I wasn't as astute of Windows user, my machine would just be gone right now. There could be hundreds or thousands of people with "bricked" machines right now because of this bug, it's very egregious Adobe, and needs to be addressed _now_.

I upgraded to v26 hoping that would fix the problem. The latest upgrade to 26.0.1 still has this issue. It doesn't occur frequently now, but it definitely happens. It seems to be occuring in files where there are hi-res placed images and the file size overall is large. I'm not sure if it's related to memory or something else since the fan always gets kicked on, but it has happened a few random times since upgrading. Closing the program, waiting a few minutes and restarting Illustrator stops this log generating process.

I also have the same issue. It takes up all the space on my hard drive. I recently updated Illustrator, but this didn't solve the issue.

I'm having this same issue