[jdminhbg]

Are you sure that every restriction that’s in the model is also spelled out in the contract? If they add new ones, do they update the contract?

[mikeyouse]

The contracts will usually say “You agree to the restrictions in our TOS” with a link to that page which allows for them to update the TOS without new signatures.

[PeterisP]

All the US megacorps tend send me emails saying "We want to change TOS, here's the new TOS that's be valid from date X, and be informed that you have the right to refuse it" (in which case they'll probably terminate the service, but I'm quite sure that if it's a paid service with some subscription, they would have to refund the remaining portion) - so they can change the TOS, but not without at least some form of agreement, even if it's an implicit one 'by continuing to use the service'.

[giancarlostoro]

Usually, contracts will note that you will be notified of changes ahead of time, if it's a good faith contract and company that is.

[gowld]

The contact's restriction is on the usage of the model, not the behavior of the model.