Would you be ok with Tesla disabling cars because you were using illegal drugs in them? Now do you get it? I'm not defending facebook. I'm telling you this behavior from Apple is truly scary. Apple is not law/moral/societal enforcement "police".
This is the ONLY way to run internal apps. and it wasn't one cert btw. Google has a similar "research app", their certs have not been revoked. Maybe because apple relies on google more? Maybe because they generate revenue from their search and app placement deals? Hrrm?
My point is simple, arbitrary revokes, without process, are a scary thing. Specially when they are done POST purchase, and have real tangible effects.