Facebook already abused the limited side loading available on iPhones to trick teenagers into installing spyware. The media did have a field day, and Apple pulled their enterprise certificate.

https://www.theverge.com/2019/1/30/18203551/apple-facebook-b...

This isn’t even a hypothetical, it really happened. And yet people still have a hard time believing Facebook (and other companies) would abuse iPhone side loading if given a chance. Of course they would!