Ignoring a developer you don't want to see is not overkill. It's the desired outcome for better or worse.
Yes, I did mean explicit as in adult and the point was if the author does not list it properly it won't matter. Same point for tags. Having a proper block system would encourage proper listing in more than just that area or you are open to more people blocking you out completely. It helps self moderate.
I'll check out your script, I appreciate you sharing! My idea here is simply that a block should be wider and hide more. That's all. Maybe blocks could have a few settings if it's ever actioned.
If downvoting, an observeable action, does not change behaviour, how could the knowledge that someone could ignore my content change it?
But reporting content for not being marked as adult will change behaviour or there will be trouble from Itch.
I just scrolled through 30 pages of most recent assets. I have found no explicit adult content. "Best" was two female low pixel models that had no clothings. But those were neither explicit nor adult in nature. Open a project in a new private browser window next time you encounter one. If a warning appears, it is marked as adult and your account was configured to see these things. Adult stuff also appears, if you use any of the "adult" tags. Those were recently removed from the tag suggestion box to prevent accidentally selecting them.
As for the overkill, if a dev has one "bad" and one "good" game and I happen to see the bad game first, ignoring the dev forever is the overkill. I can just as well ignore the project. It is just a key stroke. Ignoring one or ten projects is not much difference.