FB's core business model is the root problem. "Working from within" is vain, naive, and futile; only Zuckerberg has the power to change the business model, and we all know thats not happening.
I don't have a problem with business model (targeted ads) but I have a massive problem with lack of honesty, and this is the distinction between Facebook and Google for me. Google tells you what they collect and gives you the controls to delete it. This is enough for me.
Facebook struggles to remember that I want my timeline kept private.
I also believe that Cambridge Analytica was no accident, FB knew what they were doing, and they decided to throw them under the bus when they changed the media turned on them.
Trust is hard to build up and can be shattered in a day.
I don't know which way is right.