I get the feeling that some people are trying to spin this into a crusade of sorts, I fully get this feeling from your words.
And there's nothing inherently wrong with that I guess, but look a the big picture as well: you've used the services of a private company for years, paying zero cents. They made a business decision after potentially delaying it for years, and you rant about control. This outrage makes little sense, we don't own Reddit, never had. We're just making noise because some of us confused private property for their own.
But if they're profitability involves alienating me as a user then I'm going to be alienated and I'm going to act like I'm alienated. I think the outrage makes perfect sense in this case. I'm equally outraged at other companies doing things that manipulate their customers for a tiny bit more profit (like shrinkflation).
Ironically they could have turned this situation into profit from me as I'm happy to pay for Reddit if it was required to allow me to use it in the way that I'm accustomed. Instead of embracing me as a customer, they want me gone.
In the end, it's their site and their decision to make, but it's understandable many people are upset by their actions and no longer want to use the site (which, btw, even if you were using it for "free" you may have been contributing in other ways via posts, comments, moderation, etc).
It also means losing potential customers - I would have been willing to upgrade to Reddit Premium to continue using Apollo, for example, but now I wouldn't even consider it.
While that's not false, look at it the other way: I've provided content for a private company for years, taking zero payment. Millions of us have. Reddit lives and dies by user submissions and comments, and taking what seems to be a stance that's wildly hostile to users feels very foolish to me.
Can you realistically expect to have some sort of return, wether in control or whatever for that? It feels more aligned to a tantrum rather than a coherent argument. Have we consiously forget how Web 2.0 works?
Why is this not an issue for user's protesting? I use Relay for Reddit on Android and I think it's absolutely the best way to view Reddit on mobile if you're a fan of old.reddit.com.
That app is going to die and I say screw them. I owe reddit nothing. If they want to turn the site into something that I don't want to use because it makes them more money that way. Good luck with that but I won't be around to see it.
I'd gladly pay for Reddit Premium (which has no ads) to continue to use 3rd party apps that I like. But it's not about the money or the ads -- it's about control.