Reading the reviews for the last 3 months in the SF South Bay, 95% are for K_AAMP's.
I'd agree, but curious to know why.  
My thinking is that K's are both competent and ethical .. they will test their RA's regularly and sanitize the facilities correctly.

There's also a well-known C-Org that's restarted in the last month -- I figured if you're a regular there, they've contacted you.  There new setup has some rough edges, but they are back at it.

Not sure why but I'm not one to look a gift horse in the mouth as the saying goes!

 
I think it's a combination of a) the girls need to earn and they don't have any other options; and b) (hopefully) a bit of extra diligence. On point b), a lovely lady I saw at a very well-known San Mateo organization told me they are tested for COVID weekly, so that probably helps them stay relatively safe, although of course it's not perfect. They also do temp checks at the door, but I think that's of limited value personall. It seems like "health theatre" in the time of COVID, like TSA is largely "security theatre" at the airport.

I could not resist the siren song of my regular at a well-known South Bay C-Org (Since they are contactable only by WeChat, I can't speak their name or leave a review).  
Had a session wearing masks,  It's the sort of weird shit that I joked about, but is now the reality.