AFFF is used in far more than just military bases. Outside of the USA, AFFF extinguishers, small vehicle/building hazard suppression systems, etc. are much more common.
AFFF is being/has been phased out pretty much everywhere in the first world. There is still plenty of it around though - disposing of, and then filling with fluorine free foam can be an expensive process.
Personally, it’s about $10/litre to dispose of. Regardless of concentration. So properly rinsing out old equipment is expensive. But I know the situation differs by country, and what’s deemed “acceptable” varies too.
Powder doesn’t contain fluorinated compounds, at least to my knowledge. The role of fluorosurfactants is in increased wetting and emulsifying with hydrocarbons. Not really applicable to a dry agent.
Many oil filters these days are accessible from the top of the engine, and IME it’s possible to get under many SUVs/CUVs/trucks far enough to remove the filter/bung without lifting anyway.
A set of drive-on ramps makes it kind of a non issue either way
But yes Phos-check isn’t that