ToS only applies to terms of continuing use of a service, if you're prepared to not be an user anymore, then the conditons of ToS are not worth the paper they're (not) written on, you can simply not accept those terms. Click-through and shrink-wrap licencing terms are not binding almost everywhere (they likely could be in USA, though).
And while USA has DMCA, in most of the world copyright (as according to Berne convention) doesn't prohibit reverse engineering but only grants a limited monopoly on copying with some exceptions - often including interoperability, so you can do that even if the copyright holder disagrees.
And while USA has DMCA, in most of the world copyright (as according to Berne convention) doesn't prohibit reverse engineering but only grants a limited monopoly on copying with some exceptions - often including interoperability, so you can do that even if the copyright holder disagrees.