adb pull gives error "access denied" - How to fix? - Android Q&A, Help & Troubleshooting

All I want to achieve is to pull subfolders ( DCIM etc.pp ) of Android's /data/media folder what successfully got mounted as RW

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To access /data partition you need root permission which is adb root
But most devices would refuse to run this command, in which case you need to install adb insecure mode. You can get that from here.
After installing the app switch to insecure mode. Then pull command should work.
Alternatively you can use adb shell to work around it:
Code:
adb shell
su
mkdir /sdcard/media
cp -R /data/media/* /sdcard/media
exit
exit
adb pull /sdcard/media
Notes:
The "*" in "/data/media/*" stands for all, which copies all files in current directory. If you want specific file just replace it with "filename.extension"
The option "-R" in "cp" command stands for recursive which copies directories, and will copy all files in respective directories as well.

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Thanks for trying to help: Unfortunately your solutions don't work at all.
FYI:
I use /data/local/tmp for intermediate storage ( permissions: rwxrwxrwx )
I can successfully copy /data/media/<SUBFOLDER> to /data/local/tmp/<SUBFOLDER> ( permissions rw-rw-rw- )
All copied files have permission rw-rw-rw-
When applying ADB PULL on /data/local/tmp/<SUBFOLDER> I still get error "Access denied" even if having additionally set owner of all
files in /data/local/tmp/<SUBFOLDER> to shell.shell and/or root.shell and/or shell.root and/or root.root

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It's working fine with me, but I used /sdcard as the copy folder.
Like I said you can only access /data partition with root. You can try the first method mentioned above.

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As mentioned none of your suggestions solved the problem.
1, ADB Insecure obviously doesn't work on Android 8+ devices, hence useless
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2. Temporarily copying to /sdcard in my case is useless too, because /sdcard is merely a symlink to /data

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So you can't even use pull command on /sdcard partition?
I only found this answer, that may be similar https://android.stackexchange.com/a/213172