There is indeed only a single legitimate use-case: Censorship resilient storage.
For everything else the available Cloud storage options are cheaper, faster, easier and more reliable.
For everything else the available Cloud storage options are cheaper, faster, easier and more reliable.
Remember that just running a Tor node makes the authorities suspicious about that person. There are few non-suspicious reasons for running Tor unfortunately from a government's perspective, you are either an activist fleeing some government censorship (sometimes, but I think that is rare) or doing something semi-illegal (much more often.)
There is a big risk that is where this is heading.