99.9% of BlueSky users use only Bluesky services. But BlueSky has a Personal Data Service for each. That means:

Those users have credible exit to take their data off BlueSky's hosting to someplace else (and as of a week or two ago to move back to BlueSky if they want).

Those users can put whatever kind of data they want in their PDS. They can host their git data via https://tangled.org . They can store their music listening scrobbles with https://teal.fm . They can blog on https://leaflet.pub .

And there's been rapidly advancing host it yourself options. Plenty of folk individually or collectively host PDS. There are alternate relays that collect &n syndicate out everyone's PDS data as that changes. Hosting the aggregation layer is significantly harder especially if you are trying to fully connect the network but there are a couple & progress is good.

it feels like a huge improvement over the status quo, and there's extremely visible developer energy building forward & rolling with the concepts. The breakdown on architecture allows for wins and work in various areas. The base seems solid, the core seems coherent & well built, built to scale not as one big thing but coherent layers. I think it's doing what you are asking for, and the signs of advancement & uptake warm my heart to see.