As others have pointed out, there are benefits to Facebook et al, both individually and collectively (though some people may ignore the latter) however there's also great harm being done through these platforms, from the creation of echo chambers to data collection (personally, I'm more worried about the former, I don't really care about privacy wrt getting ads sent to me).
So I don't blame Facebook for building a platform people want to use, but I do blame them for the damage it's causing. People that care strongly about the open web (not really me, honestly, as long as it exists I'm content, imo people don't have to use it) likely feel similarly.
I mean let's be honest, there existed echo chambers in the first villages people founded. When I visit my relatives who live in villages, trust me, there is plenty of fascist echo chambers and they don't need internet to participate. The online platforms aren't a cause, they are just facilitating it. I believe it really reframes the problem
I don't think fascism is a real problem on the net and I know some popular places they are around. It got some reactionary traction in the last years, but they were derided and made fun off for years before and they never made significant inroads.
What really helps and has helped them is putting people und general suspicion and restricting user rights. That massively helps fascists. The increased content control is a major success fascists had achieved the last years even while not in power.
How is the servife providers choosing to restrict content furthering fascism? Fascism is explicitly about state control. Twitter banning nazis isn't fascism. I would maybe agree that things like restrictions on repair and copyright restrictions are some kind of corporatist fascism in that they are furthering state control, but I don't think that's what you're talking about.
So I don't blame Facebook for building a platform people want to use, but I do blame them for the damage it's causing. People that care strongly about the open web (not really me, honestly, as long as it exists I'm content, imo people don't have to use it) likely feel similarly.