The CEO complained that the 90% payout to creators was unsustainable (the article referes to it as "too generous": https://www.cnbc.com/2019/01/23/crowd-funding-platform-patreon-announces-it-will-pay-out-half-a-billion-dollars-to-content-creators-in-2019.html … Implying that in the future they'd be keeping a bigger cut.
Until implications become policies, people like me have to take that chance or be out on the street.