I mean they could, if they had their own app. It’s like how something like Angie’s list has its own rules to. It’s a shit setup but it’s not wrong.
Im suprised there isn’t something like you see with all those booking apps. Like if run, say, a barber shop, apps that’ll handle booking and payment are a dime a dozen (and obviously you set your own prices). The app gets a cut but it’s priced for what it is: software providing a value, not like Uber/Lyft where the cut is “fuck you what are you going to do about it”.