1. I agree. I wrote a dissertation on why I believe this to be the case a few pages back.
2. Up until now, the Model 3 and Model Y FSD Beta testers have literally been watched by the cabin camera; it tracks eye movement to determine whether or not you're paying attention, and that's what they've used so far to determine "safe" drivers. They may have other ways of tracking safe beta users, but this has been the only one discovered to be a for-sure thing so far. And yes, some people have been kicked out of FSD Beta due to unsafe driving. For more information on the eye tracking, check out @greentheonly and
@Tristan (I think that's right) on Twitter.
3. In addition to the eye tracking mentioned in #2, it is possible that they'll use Safety Score in addition to eye tracking to determine your worthiness to stay in the beta program, although Elon hasn't said exactly
how they'll monitor us, he has said that you'll need to continue to be a safe driver to stay in the game.