Impressive, since "network effects" are what keeps people on a platform. Why move off Xitter or FB when everyone's on there, and not on the new place? Keep moving a significant fraction of a million people every week, and pretty soon, it'll be where everyone is.
My partner, who is very non-technical, signed up for a BlueSky as well this week: "all the teacher blogs have declared that they are moving over". Looks like everyone has had enough.