Facebook messenger screen sharing and video calling is really good. But I still prefer using high end quality tools like Zoom, Webex or R-HUB web conferencing servers for all my business meetings, screen sharing application sharing, video calling etc. This is because it provides better encryption and security to data transferred via online meetings.
The screen sharing feature on the Messenger has been available on android since last year.
Yeah, Facebook, AKA the ultimate data thief will certainly never abuse it to gather data on people's screen, why would they ?