[falcolas]

It's a bit more insidious than 10%.

Flattr takes 7.5%.

Their payment processor takes 9%.

Withdrawing costs you $3.

And people call Patreon's 5% (on top of Stripe's 3%) outrageous. I guess it's better than the walled garden 30%, for popular enough sites.

[bonqis]

Stripe charges 2.9% + 30¢. So on $3 that would be 0.387 cents that is 12.9% fee.

[eps]

Stripe is not meant for smaller payments, but even then it's less than Apple's eye-gouging 30%.