To solve the Reply Guy shit, I added a button to my nostrudel fork to block any spammer at the Relay Level with 1-click.  How come nobody else does this? Some nostr relays relays have tools to stop all this spam but admins don't do anything. 

The same features exist on every alternative to Nostr. NIP05's are requested and approved by an admin. They only way a spammer could do this kind of attack would be to buy his own domain and broadcast to every relay and then any admin can simply block that domain in seconds.