- You need to remain out of the shitlist of a handful of “spam and anti-evil” authorities (getting on a list means your site gets blocked by all the big browsers and can be permanent or take a long time to resolve)
- You need permission to host your content from the: hardware / cloud provider, the datacentre if you self-host, and / or intermediary ISPs for peering (if no-one will peer, your site may as well not exists)
There are some other parties you need permission or blessing from that don’t come immediately to mind.