Same reason why Facebook, Instagram, Twitter, YouTube, etc. don't have alternative clients.
Nothing unusual.
Reddit is proceeding along the well-trodden path to monetization optimization.
Realistically, it was only a matter of time. Also predicted here: [0]
I agree. And I think people should also keep in mind that OSes also have APIs as well, and should be wary of systems that try to prevent user freedom.
Then again, I've been running Linux for ages now. And I don't have to worry about anti-user garbageware on a forced update coming my way, or updates that de-feature my system.
The difference is really that Reddit was relatively late in a concerted effort to monetize.
But it winds up at the same place regardless.