Gossip and Nostrudel have this option. I wish more apps had it. Maybe Damus?
In fact we need apps that don't even have this option, they could just not implement it.
Discussion
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Damus has had option to hide reactions for almost half a year. 
can you hide zaps too?
I'll add it tomorrow, curious to see how it feels
Love the idea. I just added it to zapthreads API (disable 'reply' to make the experience read-only)
It's live here: https://zapthreads.dev/ - including the notices that followed your PR