To play devil's advocate here, I'll just point out that:
1.) any time a company changes its TOS or fair use policy, it's going to be after people have signed up. Otherwise companies would never be able to update either: they would need to end everyone's access, update, then re-sign everyone up. Or alternatively they would need to apply a "by member" policy depending on when you signed up, for how long, when your renewal is, etc...which I can't even imagine how they would actually execute.
2.) I think an email notification would be a good idea in general (like most e-companies do annually), though tbh I don't think I've ever received a single TOS or fair use policy update notification from any porn company I've ever subscribed to, so I don't think it's by any means SLR-exclusive.