I think the issue is more that these are for-profit corporations who care almost exclusively about advertising revenue. Now, if 10% of your 'product' (*your users) is driving away the other 90% of your product, and you can no longer sell them to your advertisers, well? I'm guessing it's more a business decision, they've decided that eliminating 'fringe views' is best for business.
It's kind of like an advertising dystopian situation, where you want this homogenized audience (preferably rather dumbed down) who will eagerly buy whatever is advertised. And, you don't want to scare any of them away.
Notice this view is not partisan or ideological, it's just pure capitalism, how can we wring the most value out of this setup for the shareholders, that's all that matters. The end result is the current mess we now have, in which nobody but the advertiser is all that happy.
It's kind of like an advertising dystopian situation, where you want this homogenized audience (preferably rather dumbed down) who will eagerly buy whatever is advertised. And, you don't want to scare any of them away.
Notice this view is not partisan or ideological, it's just pure capitalism, how can we wring the most value out of this setup for the shareholders, that's all that matters. The end result is the current mess we now have, in which nobody but the advertiser is all that happy.