Patreon is the obvious one.

18 years ago I invented a new methodology for paying short fiction writers and even though I only did it for two years others picked it up and it's still going strong in its little way, which is a little weird. Maybe I'll write about that at some point. I get a lot of the same feeling here, like we've discovered a new technology that will allow us to build systems with very differently-characterized overhead costs than we've ever seen before. And there will be ways to turn that to our advantage.