With so many kids homeschooled, tutoring the last couple of months was probably a gold mine. Many parents run into a hard wall with respect to math and science and can no longer help their kids.
It’s working out really well for everyone involved. We may just keep her on even when daycare opens back up.
$20 seems to be above-market everywhere for one kid, and everywhere except SF and NY for two kids. But it wouldn't surprise me if there's finer-grained variation - sitters probably cost more in the richer parts of a metro area than in the poorer parts of the same metro area.
I pay the people who house sit and watch my pets, I still consider it a favor in addition to paying them.
Licensing might be an issue, as some people have mentioned. More importantly, though, I wouldn't trust my kid to someone who doesn't have experience with kids. So this may or may not be an option for your friend.