All a matter of luck or bad luck
I know a guy who's was rawdogging in Bangkok past 15 years, and only got Chlamydia / gonorrhea a handful of times, never HIV and this was during the days when HIV was prevalent and no PrEP was available. On the flip side, while PrEP is super effective, it's also not 100%, so you play Roulette with a 100-chamber gun with 1 bullet vs a revolver
I've been trying to break the habit of going raw. It's one of those vicious cycle things, the more I do it (raw), the harder it is for me to cum with a condom. My last trip my dick went limp as soon as the girl put the condom on. Will need to try and exert self control, especially since I can't take PrEP (due to an existing medical condition)