Yup, this exact timeline of degraded experience on Facebook led me to disable my account. I haven't reactivated it in over a year, and I'm happier for it.
Some forum software allows the owners to create an app then prompts you to install their app. Not sure which it is, but it's super annoying.
Over the last couple, reddit has significantly limited their mobile website utility, requiring login (like Instagram) and nagging you to download the app.
Marketing metrics seem to have overcome usability in terms of relative importance. It's really frustrating to see what the movie computing environment has become.