Okay, but that's a poor comparison. For starters, print has an extremely high overhead, and there's a lot of people (the publisher, editors, agents, etc) taking a cut of those sales.
But also. When you are publishing a book, you sign a contact. A contract that lays out in excruciating detail who gets what of the sales. Or at the very least, precisely what percentage the author themselves will get.
Tapas has none of that. No transparency at all. Aside from an extremely vague TOS that we agree to when we create our accounts. There is only a small section about the support program that states that users get 85% of the tips they are given. Which is super misleading. And another part which tries to say that Ink has no "real world value" while it is being turned into real world value when given to artists.
This isn't about how much they're taking. It's the fact that they're not SAYING how much they're taking.
If someone buys $2 in Ink and gives it to a creator, they think they're giving $2 to that person. They don't tell anyone "hey, because you didn't shell out for the $50, we're gonna take a chunk of that right off the top."
By saying in their TOS and their official statements that Ink has "no real world value" that means they can arbitrarily decide what that means to a creator. They could, one day, decide it's worth half as much as it is now while charging people the same amount. And they wouldn't have to alert anyone or say anything.
I don't know how many different ways I can say this: It's not about the percentage they're taking. It's the lack of transparency about it.