I agree with you about Facebook being keen on keeping people on their server and that can be buttressed by the fact that technology companies such as Facebook are heavily dependent on the tons of user information they harvest while users are surfing their platform and often time users are so naive about this until scandals like the Cambridge Analytica sprung up. That is the more reason why a lot of people are still very skeptical about how effective this upcoming tool will be. Lets keep our eyes widely open and our fingers carefully crossed.