They do, but the vast majority of fluids the average person consumes comes in products made elsewhere, along with restaurants, etc. So you can RO your home water, but unless you don't eat anything made elsewhere, water your own crops, etc, you need comprehensive protections to avoid them.
Bit of research suggests even counter top filters help, though with very wide range of opinions as to how much it helps and which PFAS it does work against (there are thousands)
