it’s baffling to me that these big tech companies haven’t created a subscription that lets you opt out of data collection

It's not baffling when you understand that big data makes a lot more money out of the data they steal from you than any money you'd be willing to give them directly. Not to mention, it allows them to cozy up to the police state agencies - possibly their most important customers.

The other reason why they haven't offered it is because nobody would take them up on the offer: most people are cheapskates who are perfectly okay giving up their privacy if they can save a buck.

And those who would gladly pay to escape the corporate surveillance machine know that it won't stop tracking them even if they do, so they don't.

The corporate surveillance economy is a self-fulfilling prophecy (as in "we do it because people like this deal" even if people don't and in reality have no other choice) and a race to the bottom.