I guess I'm missing how that relates to the comparison I made.

Google at least lets me back things up.

Most services do not allow it at all.

So there's no restoring anywhere else at all, no chance.

Having the data I could at least have a chance that some service might offer a rebuilt import option to pick up those google users ... or I could build it myself / at least have the information.

To me that's still leaps and bounds better than any other options that I know of.