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Laws and contracts cannot be retroactiveCould you expand upon this a bit? In the US bills of attainder and ex post facto laws were clearly banned for both the Federal and State government from the founding of the country, though I remember reading that despite statements from the founders SCOTUS has been shakier on applying it to civil vs criminal law.
But it's not clear to me how that relates to purely private contracts, unless there is something in California regulating it? Further to your own point:
>A new TOS can force you to cede rights from that point onward.
It seems like that could cover this just fine couldn't it? Ie., two parties could agree that regardless of past or ongoing legal interactions, any future new legal interactions could be governed under different rules. I'm not sure that'd be "retroactive", it doesn't govern anything undertaken under the previous agreement, it modifies it going forward. Are you saying that contracts may never be modified from their original form? That doesn't jive at all with my (admittedly non-lawyer) understanding. It'd be against all sorts of bankruptcy proceedings and private settlements for example, since those often involve modifying previously agreed terms of previously engaged in financial exchanges.
Granted this all puts aside questions of adhesion and whether he even did agree to new TOS at all of course. But assuming during his ongoing play he was presented with a new TOS, agreed to it, and then at a later date filed suit, it doesn't seem novel at least (even if we think certain rights should not be contractable) that their legal interactions after the agreement date would be governed by the new TOS.