The problem I have with these sort of initiatives is that they don't solve the real problem. Here's the thing: I want to own some of my data, but I don't want to own most of it, because it shouldn't be collected in the first place.
Solid and other alike work in theory, but in practice I have some serious doubts. I believe that instead of owning your data is far much better to camouflage or destroy your data before it gets out there.