It's good FUD. You re-iterate their talking points. (Also, no CTA, no takeaway, just "worry!")

As others have said, the data has to be publishable to be useful. We do have data export laws. The format is known to be ready to use interoperably, not some private schema--atop the PBC commitment, which will at least have moderate legal costs if not a guarantee. It has unequivocally set a new high bar.

They seem pretty locked in to doing what they committed to. The day may come when they turn. It may come first by friction, but the turn has to be pretty complete, because the data is pretty open. What's needed to view it, use it at all, is pretty close to what's needed to host it.

"The site whose value prop is sharing your posts and data with other apps may stop sharing your posts and data with other apps." Yeah, it's possible. It's also possible they just close.