Olive oil is a barrier disrupter, so that may have had something to do with it. Also, unless you are cleansing that stuff off the skin thoroughly, I can’t see how it wouldn’t break you out. Maybe a deeper cleanse would help. But the olive oil while in accutane is not a great idea.

Sounds like the carnivorous version of the coconut oil craze. People seem to be dead set on using their kitchen stuff as skincare.

EWG is not a reliable organization. Here is a previous skincare addiction post about why they are untrustworthy.

I would not recommend using beef tallow as skincare.

It's fine. It's a denser fat so it's less heart healthy, and it has its own flavour, and it's certainly not the highest smoke point option, nor the cheapest.

Any butter will have a fairly low smoke point unless you clarify it.

Have you considered sunflower or peanut oil? What exactly are your criteria for selecting a cooking fat?