I would say that the ability for spam attacks is Nostr's Biggest issue. We are lucky things aren't that bad yet, I am no pro and barely know any code but even i could build spam bots that could basically make Nostr unusable for a lot of people, I would never ever do this obviously, but I could. This is really dangerous I think. I have already built spam bots like that and tested them only on myself and stuff, even got one to like a note 1,000 times in a matter of seconds.