I don't understand why people are acting like this is ridiculous and will obviously fail. 30% is the same cut that Apple and Google take for everything that goes through their app stores, including all in-app purchases. It's the same cut that Steam takes. It's the same cut that YouTube takes for channel membership. Twitch takes an even larger cut: 50% from subscriptions. It's extremely well-established that people are comfortable with platforms taking that large of a portion.
Patreon is the outlier, and they're dropping hints now that it probably isn't going to last: https://www.cnbc.com/2019/01/23/crowd-funding-platform-patre...