I’ll go even further and say people were mostly upset about the API because of its harm to 3rd party apps. Having 3rd party apps isn’t even really the norm for websites, but reddit’s app is awful. If they had a decent app, this probably never became a big deal in the first place.
Not just that it was awful, Reddit was way fucking late to the game. The official app didn’t launch until what, 2016 or 2017? They were at least five years behind the 3PAs and like 10 years behind smartphone apps in general.
It’s a fair bet that most people who used 3PAs to access Reddit did so because they had been using it since before the official app and saw no reason to change.