Comment by __MatrixMan__

If that's your threat model, then I think the way forward is to maintain separate identities. There are trade-offs there also of course: fragment yourself too much and the people who trust you will now only trust a portion of what you have to say... unless you have the time and energy to rebuild that trust multiple times.

Of course that's the same with the web we have today, the only difference is that you get control over which data goes with which identity rather than having that decision made for you by the platform boundaries.