>>JohnFe+(OP)
This is not true. At least in the US you are required to notify customers when you change the terms of service, and as far as I know in the EU as well.
>>espere+B41
I'm well aware of the US court ruling in the early 2000s that declared the users must be notified of ToS changes. And yet, companies frequently change ToS without providing such notification in a way that customers will actually notice anyway, so it doesn't seem to matter much.