There are a fair amount of active users on nostr who don't really care about zaps, so it might alienate a few, sure a minority.
I suppose there are some clients sort of working on similar things, the community section of Nostrudel for example, will only show you posts from communities. Which are sorta moderated, or at least seem to currently be on topic (with no need for moderation probably except for spambots). This kinda functions as a tag. A few clients are focusing on this topic-based feed rather than twitter following people based feed. 🤔
Maybe that is kinda the same?