The problem is that relays all end up mixed together.  When you post, it goes to all the relays you subscribe to. If someone shares or comments , it spreads or relays share posts somehow.

Nostr is designed to be a big melting pot mess unless everyone on a relay only connects to that relay to interact. 
 

 I understand and what is the problem there ??? 

 The database grows very quickly in size and spammers add on top of that.

You wont be able to easily isolate posts for a relay or community because the clients blast each post to your relays 

 

 Yeap, you’re right, nuking the relay would solve the problem temporarily and put everything at ease, but I think it's enough 

 Communites need their history of content otherwise its just like anything else  

 I understand your point of view