At the very least, you can be sure they'll never change the terms of the agreement to be more beneficial for you, though.

So just treat it as a best case scenario, knowing that it can get even worse.

Just assume the worse then, save yourself some time.

Well yeah, that's kinda the idea, but sometimes it's nice to know what 'the worst' will entail

At this point every EULA or TOS change should begin with the heading:

We Are Altering The Deal. Pray We Don't Alter It Any Further