The other side of this is that companies do want to change their T&C from time to time, so what do they do, force you to quit and then sign up again? That adds a lot of friction. Or do they tag things and say "Customer X signed up on this date, so he is bound by T&C number 12, whereas this other customer signed up a year later and is bound by T&C number 13". That seems unwieldy since there is a common infrastructure.

I get emails from time to time that "Policy X has changed and will take a effect in X weeks" so at least I'm given advance notice, and am basically OK with that approach as long as the changes are spelled out clearly and not hidden in hundreds of pages of legalese. Maybe an LLM would help here, and translate what the new changes in terms really means so I can decide whether to continue with the service or not. In general I'm OK as long as I'm given enough notice and it's clear what is happening.

The same thing happens with pricing. What does a company do when they want to increase rates, or change their products? They send out a notification that starting on a certain date, the prices will go up. I don't think anyone objects to that. How is a T&C change different?

I work for a digital bank and the versioning is essentially exactly how we handle T&Cs. The user accepts a certain version of some terms, and if we launch for example a new product that requires changed T&Cs then we ask the user to accept them if they want to use the new product. If they don't, well, then they just keep using the existing offering without accepting any new terms.

> What does a company do when they want to increase rates, or change their products? They send out a notification that starting on a certain date, the prices will go up. I don't think anyone objects to that.

Of course you do. I have a fixed contract with my mobile carrier - if they want to change rates, tough luck. Once the current contract expires, they can indeed notify me that the new contract will auto-renew with a new rate, and I can either accept it or choose a new carrier. But they very much can't change prices, or alter services rendered, while the current contract is in force.