But if your usage of your computer that you bought depends on their servers, it seems they would have some sort of say in how you use it.
That is, they can negotiate with you using your desire to access their servers as leverage.
You can refuse to negotiate, in which case they can take steps to block your access to their server. You can use technological means to get around that, but then they can adjust their own technology to block your new strategy.
And then you're in a war.