100% agreed. I'd never use this type of donation service because it doesn't seem serious enough. The artist that side has to ask people to "buy me a coffee" is not the kind of artist that takes it seriously, and, say, uses art station and has a complete portfolio. "Buy me a coffee" just sounds unproffesional.

When I first saw this in tumblr, I thought: "I wouldn't want to be the artist that needs charity to survive". It's like Patreon without responsabilities or commitment...It just feels childish.

That said, I'm talking about artists only here.