Nostr doesn't suck. It's an idea in progress and it is very inspiring how it has been taken up and is being worked on.
Anyone who expects these things to come out of the box fully formed is not thinking straight. Unfortunately, in a world where censorship is a very big and real problem, people (including me) sometimes have little patience for the breathless nonsens masquerading as thinking.
Nostr should exist, just like Mastedon. BBses, Napster, Gnutella, BitTorrent were all steps in a progressoin towards an unstoppable and super efficient network (BitTorrent) that solved a very big problem leading to the ultimate question:
"What are Your Latest \/\/ 4 |^ 3 z"
I can't say where on the BBS to BitTorrent scale Nostr is, or even what its final destination is. What I can say is claiming that it can stop spam "Becuz digital signat00z" is ridiculous and very silly.