which rewards developers who either ignore or do not know the sensitive content label exists.
Well, they also risk having they project become unlisted, or worse … I don’t know specific details for Itch, but in general one doesn’t want to step over the rules of the platform that is hosting their projects, especially if that platform can survive without them.
Instead of trying to game the system, I’d suggest to focus on the intention of the rules. If your project contains adult content, then mark it with the sensitive content option.