I can't imagine arguing or thinking seriously that the majority of computers exist even "effectively" to only hurt us in some way. By computer did you actually mean some sort of antique ball torture device? I won't argue that the companies that control and make these devices aren't evil and responsible for some pretty awful things but it's really odd to argue that most users are "hurting" themselves by using the devices they use.
I promise they would consider having the type of full control and responsibility you're describing as far more harmful and annoying than anything those big 4 could accomplish to them individually.
I promise they would consider having the type of full control and responsibility you're describing as far more harmful and annoying than anything those big 4 could accomplish to them individually.