Just so it's clear, I'm not dissing Tapas here. I think sharing ad revenue is good, and so is having premium comics. Giving readers the option to watch videos to earn coins is also a cool thing. But tipping, by itself and as a concept, is not something an artist should seek out if they want to maintain a certain image.
I mean, it's one thing to have money thrown at you wherever you go and another to have in hand the digital equivalent of a tin cup.
Not to diss street performers either. I respect the skill and effort they put in, but the business model is basically high-effort begging. And it doesn't necessarily transfer to the online arts scene. Street performers and waitresses have tradition, social pressure, and face-to-face interaction on their side. Digital content creators don't.
Without a Patreon, readers can assume that they're the product. That is, that the artist makes money from advertising. But with a Patreon the artist is basically admitting that payment is optional. Which means it's as good as free. And what is free is worthless.