There are services like that for Mastodon [0]. But a provider that lets you host from a choice of e.g. mastodon, pleroma, lemmy etc would be interesting.
[0]: https://masto.host/
[0]: https://masto.host/
Since that the original problem is that admins may want to override built-in censorship policies to suit their instance's needs and values, I don't think an even more censorious centralized authority is a great example of a solution.
Using any hosting provider is ultimately a risk compared to hosting yourself, that's the price you pay for not having the know-how to host it yourself.
And even if you do selfhost, cloudflare may wake up one day and say "nah".