Because you need to have somewhere to connect to. You could buy bandwidth from networks such as this list or this list, but then you are at the whim of getting cut off if they feel like it.
You can have your own warehouse of servers, but you need to connect them somewhere.
IIRC one of them is through Epik, one is through Godaddy, the other through Porkbun, and Namecheap or something like that (might have conflated the old ones in there)
Will you consider a hidden service (Tor) or similar?