It's pretty worrisome that they say "The Gigsters come from companies like Google or Stripe that are looking for some extra projects." Google is pretty strict about side projects done by its employees; its IP release claims ownership over anything "along the lines of business of Google", which the company has in the past interpreted as "anything tech-related". There's a release process, but I really doubt they would…
IANAL nor do I play one on TV but I don't know if I actually believe that is legal - and if it is then it's a huge legal nightmare.
Take this project for example[1]. He worked on it before he was an employee of Google and after - does that mean Google automatically gets copyright over the project? What about after he leaves Google? What about if he never touched it while working at Google - does Google still get automatic copyright over it?
[1] https://github.com/snapframework/snap-server/commit/5e4850d4...