To decentralize twitter you need people to self host. To get people to self host, you basically have two knobs: simplicity and incentives. 1/N

Increase simplicity through good UX. (As I attempted a first stab at with @MozillaHubs Cloud.) This means full automation not just of setup but of long term maintenance and upgrades. Set it and forget it. Totally do-able. As easy as SaaS, but self hosted, should be the goal.

Increase incentives through crypto. Operating a node should behave like owning a bond. A dumb, low volatile fixed income stream, where you put capital in and income flows out at a known rate. Default risk is if the network itself dies out, and is what you're compensated for.

For this, you need to generate enough wealth people will pay for. Intellectual freedom is suddenly a burgeoning value proposition. This, in combination with the need to mitigate spammers, makes it worth trying the SomethingAwful Forums model: an entry fee. (SA's was $10.)

The catch: your access could be revoked by moderators. You got back in by ponying up another $10. You could also be permabanned. What's the decentralized analog? My guess is it's a crypto contract based moderation + meta moderation system, as was done on sites like Slashdot.

In the end, a world where you pay a decentralized system access to speak into the network, and can collect a competitive fixed income stream for relinquishing control of your capital temporarily to backstop it, seems like a much better world than we live in now.