> one man has the entire monopoly over our entire online social life

You chose that. I don't need Facebook/Insta/What's App to have an "online social life." Literally nobody is forced to participate in that nonsense. Use Snap, iMessage, Twitter, Pinterest, Reddit, Slack, IRC, 500px, Vimeo, Signal, email, SMS, phone calls -- there are plenty of options.

FB, Insta, What's App aren't the entirety of the social media universe. You can't be "mad" at Facebook and then continue to use it. That's a bit hypocritical. If this situation is really that important, then stop using those services! It seems like the same thought patterns seen in abusive relationships: he beats me, but I can't live without him. That's bullshit. Leave those platforms. You see it as a "monopoly" because you allow it to be.