I think the answer is the legal department is reminding them daily that the more people they let in, the riskier things get. And likely (unfortunately), the FSD beta just isn't there yet. I am have come to terms with the fact that it will be years before it is really ready. I am enjoying my FSD suite of features and am excited to get my camera upgrade so that i can use autopark with painted lines, but i really dont expect to be using FSD until next year at the EARLIEST and more likely 2024.
I look forward to future when my car can take itself to service appointments, drive cross country to pick me up, and work as a robotaxi to make me some side cheddar. But I'm not delusional enough to think that will all happen any sooner than 5 - 15 years out. Hope I'm wrong.