even if you could update state* once you gave access to anything it's out of your control as it might be cached somewhere else. This is why I mentioned for future changes rather than what you already allowed.

And you are right twitter can still have that clause, and they can cause they have somethign to offer (i.e. a userbase) but if the content of everyone would be somewhere else other competiors would be able to offer it and then competiion for users would tend to make those terms more accessible to those that care enough to read them.

* you can by doing it as in an event sourcing system. After all blockchains+smart contracts are similar to a giant state machine