@Hyolobrika >is there any way part of the internet can be deleted?
Nope, as a bunch of IP packets being blasted around cannot be "deleted".

IANA delegates the allocation of IP addresses, so they could "withdraw" IP addresses if they wanted, but they usually don't do that (IP addresses are really just a number and delegation should really be just so two computers don't unintentionally end up with the same IP address).

If an upstream was to start playing around with BGP and routing tables, routing to AS's could be broken, but it'll be a lot faster and more effective just to unplug any upstream links from the upstream side.