Re: Docker tweaked its terms of service
The usual boilerplate on T&C says that they may modify the conditions and the only recourse for the user is either implicitly accept the new terms by continuing usage of the services or leave. The most you might get are either the prorrated subscription fee unused for non-acceptance of new terms and the no application of any "quit-early" penalties (which used to be the standard issue on telecoms and utilities services not so long ago, at least where I live). This has been this way for ages, and if it hasn't been successfully challenged in court yet I hold no hope whatsoever to change.
However, there's a catch for hosting services: what if you do not log in to the service to administer it and be slapped in the face with the new T&C? I remember when the Photobucket service decided that "hot-linking images from third-party websites" required from a certain point in time the highest-grade account, and you had to either pay for it or let all your images render everywhere else with a "this fella hadn't paid our fee so you can't see a thing" placeholder image. Some sort of a ransomware-as-a-service, you might say.
But people who did not log in were never shown the new T&C and so these could not be enforced. So, if you logged in into your account you were screwed, but as long as you did not you were spared. Pretty sure if they did it that way was only because the lawyers told so to prevent a sueball. That's also why hosting-like services usually have a clause to allow them to purge content if no logins are made for a while.