Requested feature overview description.
When a user tries to upload something, check all the given artist tags to see if any of them are on the DNP list and give a warning prompt

Why would it be useful?
A last chance if somebody either didn't check the DNP list or missed thr artist's name

What part(s) of the site page(s) are affected?
Uploading

For an unofficial version eSix Extend does exactly this and can be found here and is very awesome overall.

Sounds like a great idea. I'm not sure why useful features like this would only be available by third party

I'm guessing there is no simple list with all dnp tags from a software perspective but I can't imagine it would be hard to make one. Maybe even auto-update it whenever something's implicated to avoid_posting. That might be tricky tho.

https://e621.net/post/upload?use_new=true
-> Preview Final Tags

There's also now warning if you are trying to do direct URL upload from known sample version instead of full version of the image.

For further feedback use forum #256093