You think Facebook would let a large percentage of users use a 3rd party app that blocks all advertisements, tracking, and other monetization? Look at how Meta treated the whole Apple tracking ordeal
If a lone dev would have made an app like Apollo for FB, they would be under 10,000 pages of litigation the next day
People don't use the FB app because its great. They would love a non-tracking version of the same service. It's just not allowed