I used to think this was true too, but then I realized that the fundamental problem with capitalism is that it's incompatible with democracy and regulation. That's why literally every capitalist country on earth (including the wealthy ones) has a problem with regulatory capture, corruption, and buyout and supplanting of the actual government.
Capitalism encourages the greediest, trickiest, and most selfish people to rise to the top and stay there through a mixture of brute force and media manipulation. In essence, it's not much different than totalitarian authoritarian governments, it's just more subtle.
Look at Fox news and right wing media bubbles for instance, or the Democratic party which opposes ranked choice voting whenever it can and constantly says one thing and does another. Humans are too greedy, selfish, and short-sighted to live and exist for long under a system like capitalism. How do we know this? Look around, climate change and pollution's already serious and it's not changing anytime soon.
We're probably already fucked, and we just don't know how much we are just yet.
If you're joining the Fediverse to take Reddit down and migrate people over... then it makes sense to talk about it. Have to strategize to identify your enemy's weaknesses it order to take 'em down. And while you're doing it, negative things about Reddit will come out. Even if it does end up being complaining, it's part of the process and it'll make people feel better while also doubling as important brainstorming.