Automatically opting-in customers to a more restrictive TOS is pretty suspect, especially given the timing. IANAL, but I'm pretty sure that a court would not allow that, given that the TOS was changed AFTER the breach and it's pretty clear that the company is trying to avoid legal issues after-the-fact.
I would expect the court would evaluate any breach under the TOS that was in effect at the time of the breach, rather than under a new (and arguably suspect one) that was put in place after it, arguably in an attempt to "rewrite history".
I would expect the court would evaluate any breach under the TOS that was in effect at the time of the breach, rather than under a new (and arguably suspect one) that was put in place after it, arguably in an attempt to "rewrite history".