> It's perfectly normal for contracts in different jurisdictions to use different wording and include different clauses.

Before signing, yes, but once signed the contract stays constant. Mutating terms of service are weird - I would expect them to be locked to a canonical URL at least, like "https://.../tos?region=eu" or ideally something that locks the version too, like "https://.../tos?version=eu-002".

Let me pose a question from a different angle - these are legal contracts we are talking about, and the version they present to the user apparently changes based only on the client IP address. So if the terms in the EU ToS are better than in the US ToS, what would prevent me from signing up with an EU IP Address the first time? I would expect to be bound to the contract I actually agree to, not just the one they "intended" to show me.

What if I sign the contract in the US, then fly to the UK?