I think there is an effort being made for this. Some folks have created https://selfprivacy.org/ and continuously developing it. I follow this project by heart
I don’t think that’s a gotcha. Using a cloud provider in a way that provides easy migration options can be valid on the spectrum of self-hosting options. The ones they list specialize in renting virts by the hour/day/month, not lock-in services with no external equivalent.