You can choose to buy Dell or not in the first place as well. (And if you say that people can have Dell products forced upon them by their company, well, they can have OpenDNS forced upon them by their network administrator as well.)
I bet when you visit dell.com, you're 2 clicks away from reading in plain English about all the crap they install on your computer.
Yes, it is a question of opt-in versus opt-out and the difficulty of making those actions.