What’s the point of renting a VPS if you only access it from your own network? I understand why a large company would do it (risk mitigation) but I don’t understand why a self-hoster wouldn’t just use an old computer at home. Your costs would be reduced and you could more easily control access.

Now that being said, most Cloud VPS providers have a firewall that you can configure from their web portal. If you whitelist your home network public IP then you can be sure that anyone connecting to your VPS will have to be doing so from your home network.