> I trust that if I buy a can of coke, it will contain coke because coke want to keep selling me coke
You don't even know what coke is, since that formula is kept secret (well, Coca Cola's at least). Also, in some countries, you'll get high-fructose corn syrup instead of cane sugar, which is believed to increase the risk of fatty liver disease, obesity etc. (caveat: Some believe the evidence is not conclusive enough for certainty.)
And why don't they just "sell you coke" everywhere? Because it makes them more money. And the raison d'etre of a commercial company/corporation is pecuniary gain. Profiting. Making money. Management is obligated to act so as to maximize profit (under legal obligations etc. etc.)
This brings us to your first point:
> it's a pretty paranoid take on the market economy.
No, it's literally what commercial companies' charters and fundamental structure requires. No conspiracy theory or paranoia.
In context of spying - if the company has determined their profits would improve by them spying on you, and that they can get away with it - then it's pretty likely they will indeed spy on you.