decentralization out of the box for the most part. Its built on ATproto protocol which is used by bluesky/created by them

The fact that all the data is open means not only that you could plausibly exit to other providers and keep all your projects data, (issues, prs, etc), but also that it's dramatically easier to build other tools that work on that same data. Triage, labelers, bots, etc, I know these are all possible on GitHub today with their API, but I think the programming model of ATProto removes a lot of friction in building and composing them.

Github is free and decentralization isn't.

Tangled very nicely gets rid of the having to run a server problem, yet still gives you a sovereign platform for doing git from. Truly divine.

The barrier is largely that Tangled is so new. People don't know about it. People don't know what Bsky & the Personal Data Server offer or they haven't been enticed out of the zero energy local minima.

There's some need for more features. For more tangled dev. Ideally for alternate clients, just because. But it's already enormously solid, the early adopters are living the better life, the future is already here and we are just waiting for devs to redistribute themselves appropriately.