The level sets the rate
A tutor teaching middle-school algebra and one teaching first-year college calculus are not selling the same product. The gap between those two hours is wider than the gap between a tutor in their first year and one in their fifteenth.
What the top of the band buys
Usually scarcity rather than skill. There are far fewer people who can teach BC calculus on a Tuesday evening than there are who can teach fractions, and a rate is a market before it is a judgement.
Ask what the tutor keeps
The number worth asking about is the share. A platform taking a third of the rate is a platform whose tutors have to charge half again to earn the same hour. Ours takes a tenth and the family pays no service fee on top of the price shown.
Judge it against the hours
Four lessons at fifty-five that fix the thing beat twelve at thirty that do not. The rate is only half a price; the other half is how many of them you end up buying.