You don’t and it isn’t. I cook exclusively on cast iron, and I oil it only before I put some food that requires oil. I use hot water and a paper towel to wipe it clean. Been using it for years, way less scrubbing than stainless 90 percent of the time.
But I use it exclusively and daily, so ymmv.

What changed about pork fat?

I don’t use soap, I just use a bit of hot water with the kitchen faucet sprayer and I have a flat metal spatula to scrape off any stuck on bits… wipe with paper towel and that’s it.

I read that veggie burgers/ processed vegetarian foods have more human DNA in them than traditional options. Plus beef is delicious and nutritious.