Even the pay-for-no ads model doesn't hold up, because if you pay for content, why wouldn't they just double-collect and make you pay for ads served with the content? I purchased my phone and my phone service, but I still get ads in my notifications. Because I didn't pay "enough" to avoid it.
It's like paying off a blackmail ransom. You give them $100 and they come back next week and say "how about another $100?"