Internet companies usually have clauses that they can terminate the agreement at any time for any reason, including “because they feel like it”. They usually don’t have to tell you why, either.
Same deal with all the “licensing” things and “digital goods ownership”. In two words: you don’t.
But it’s been that way for ages.
Especially if it’s something free or subscription based. It’s just a “our rules have changed, if you don’t like it stop using it/paying for it”
It’s get very dodgy when it’s a physical thing you’ve bought like that Roku agreement a few weeks back, but I doubt they’ll let that stop them.
They can just put in the initial contract a clause that basically they can change the contract as they see fit, when they see fit, and if you don’t like it, too bad.
That pretty much wipes out a lot of recourse for most people when it comes to changes in costs and services.