I’m not planning on reading that “never show me this again button” thread since that would likely tell me stuff I already realized about this topic, but if I had to give a possible user-friendly implementation of that type of button….
I’d have to say, the most user-friendly implementation of a “don’t show me __ tag(s)” type of filter I’ve ever seen in an online store platform is Steam’s “Exclude from my store” menu section’s “Tags to exclude” feature where the individual user can define up to 10 tags that they want the Steam store to globally exclude results that contain the tags selected.
since you mentioned it is known that the actual exclusion processing is happening on the server-side, all the itch.io devs would need to do is implement a quick validation that checks against the array of user-specified tags to exclude before serving the results to the front-end. That isn’t very difficult to pull off. I’m sure even a Junior Developer should have the skills to create this feature so there’s no valid reason why any of the veteran devs on the itch dev team couldn’t pull this off as well.
BTW, sorry if that sounds like a rant… that was me in programming geek mode writing with no filter (pun not intended lolz) and I really got excited about the idea of creating my own version of this feature just for fun… my bad! 😅