This is simply not true. You can buy or rent a server right now, run any kind of communication software on it that you want, and use that to communicate with anyone anywhere in the world, 100% ad-free. There are even pre-existing software stacks, like Mastodon, that make setting this up trivial.
I honestly find it disturbing that you don't appear to realise that you are asking for control over someone else's communication platform.