I am not sure which Meta apps open ports, but e.g. Samsung phones come with a bunch of Meta apps pre-shipped. IIRC just removing the Facebook app is is not enough, there is another service installed that is not visible as an app (com.facebook.services etc.), which you can only uninstall from the data partition with something like ADB/UAD.

Or buy an iPhone or a Pixel.

> Not only our their websites painful which discourages use, websites are more sandboxed.

This isn't remotely true. It is pretty trivial for a well-resourced engineering organization to generate unique fingerprints of users with common browser features.