federated computer isn't even federated.

They'll host open source software for you. By using the FOSS, you're able to export your data in a shared format and migrate to other hosts running the same FOSS (or self host your data). This is not possible with Web2.0 apps because each is a walled garden.

With all Web2.0 apps (including fed computer), you still cannot verify that they are not viewing your data. And you cannot verify they will not lose your data.

Better to host yourself and learn to keep data safe or find an Uncle Jim you trust. Its better than trust some random company that would rather invest money in stealing your attention than making a better product