say for example I am running a cashu mint from whatever location, I have a contract with my ISP providing me internet access so my cashu mint can be online/discoverable. this ISP has given me an IP address I can be reached at. if I think decide I will not advertise my IP, and only be discoverable through the mints npub, wouldn't all traffic still be going to and from the ISP anyways? meaning they can just have a look at the packets, see what's going on(roughly) and block access?