The terms of service are the default contract. Presumably it has a we-can-screw-you-whenever clause, but sometimes the corporate lawyers screw up and you can actually get them for violating their own ToS.
Indeed, Courtland, and even on IndieHackers you see a lot of stories about platform risk, platforms which indie hackers often use to build a good product but always seem surprised that they got rugged, as if the previous X stories didn't show that it inevitably happens.