@mangeurdenuage Today I was thinking that there could be a case for invalidating a contract in the case when you've already paid for a product (a phone, a smart TV...), but you can't use it until you accept said contract, or when it changes once you've started using the product and it would be rendered useless if you don't accept the new contract.

The latter happened to me with an LG TV. Until I accept the new contract (which basically would send my data to South Korea), I can't use the TV's Internet connection or the apps I have installed.