AFAIU It's not a blanket ban on all data transfers, so if a user clearly wants and authorizes it Facebook can still show their profile and posts to people in th

AFAIU It's not a blanket ban on all data transfers, so if a user clearly wants and authorizes it Facebook can still show their profile and posts to people in the US and transfer data as needed for that. But the legal situation is such that a controller needs to be very precise about what they transfer and how they justify doing that. Which is difficult, which is why there has been so much noise about trying to find something that again lets companies just say "processing in the US is possible under the same standards as in the EU, so we can do all our processing wherever we think is convenient", which saves them a ton of work. But I'd expect until the US is actually willing to make legal changes any such thing will be rightfully rejected by the courts again.