> What I don't understand is why they think they have a right to demand that a platform they aren't even paying for should cater to them.

Because those platforms consistently and repeatedly lie to their users: they claim that they are here to serve you, or to help connect you, or help you find things you love.

If all you ever hear is "we're here to help you!", is it any wonder people expect help with their issues?

Maybe if they changed their tagline to something like "Facebook: Here to sell you to advertisers" then people's expectations would be different.