Yeesssh. 

I haven't come across anything like that. 
I suppose that there could be actors on here that are trying to saturate the network with that filth. 

Hopefully the big brains on here can find ways to filter it out.

I think nostr has great potential.  

 i think its fixable on Nostr: crowd sourced content sorting aka #peercuration https://github.com/baumbit/peercuration?tab=readme-ov-file#peercuration