When I was running a home server as a kid, I IP-blocked the entire continent of Asia because I was constantly getting pings, portscans, HTTP path guesses, SSH auth attempts, etc randomly from there. Of course I secured my stuff to the best of my knowledge, but I still didn't want that harassment cause 1. who knows 2. could be ddos'd.

When finding help on how to do this, people were saying it's useless cause they can proxy/VPN anyway, but obviously that has some cost to them because they weren't doing that. So seeing how I had no legitimate traffic from there, it was an easy choice and cut out like 99% of abuse.