I'm pretty sure the real issue is the data collection Reddit wants about user habits. They can't get thst from 3rd party apps, even if they make browsing habit data (scroll speeds, post linger time, ads displayed, etc) a mandatory part of the API they cannot verify what the 3rd party app is reporting and it becomes junk data that advertisers cannot rely on. They need complete ecosystem control to make the marketing optimizers happy. So, fuck the consumer!