Unless you have a truly original idea that nobody who has given this throught stumbled on - it's not, and it won't work for all the same reasons that Mastodon does not work.

Those reasons are harassment, child pornography, and having to delegate censorship to moderators/people with way too much time on their hands.

You end up back where you started, with a clunky layer of centralized censorship on top of a distributed system.

I believe it is.

https://memberapp.github.io/

All posts are stored on the blockchain using the Memo protocol.

I haven't looked at the software stack but this can't compete with whatsapp/telegram/line on look.