If you add another advertisement to your pages, you generate more revenue. If you track your users better, now you can deliver tailored ads and your conversion rates are higher. If you restrict users from leaving your walled garden ecosystem, now you get all the juice from whatever attention they have.
The question is: At which point do we reach the breaking point?
And I think the answer is: We are very close.
Facebook. Twitter. Medium. All desparate to withhold content they didn’t even create until you cough up your personal details.