The WHY in why Facebook (YouTube, Snap, Twitter, Et. al) are bad is so much more than their data policies or advertising it's that their entire existence is predicated on a LIE.
A lie so pervasive that almost the entire wold believes it.
That there service is "free" and that our contributions are not valuable.
When in fact there is nothing more invaluable than our time and attention, of which we are each given only a finite amount to spend.