So there's a part halfway through the video where she pastes in a TikTok video of a guy warning against using Facebook Messenger because it's basically a spying device, scanning all your Wi-Fi networks for devices and that sort of thing.
I thought to myself, "he must be talking about the Android version of the app". Indeed, if you're on Android, yikes, I wouldn't install it:
https://crambler.com/truth-about-facebook-messenger-app-privacy/#facebook-messenger-permissions
The iPhone does block companies like Meta and Google from vacuuming up too much of your data.