Imho, the level of risk depends on how & where we do our duties as cumdumps. Doing it at home, in saunas, in private parties or on international events is not the same.
At home, during Covid, I was able to put myself at tops disposal at least 4 months without catching a single STI. But each time I attend an event such as BiohasardMen, I come back with a whole set of STDs: hepatitis C, gono, chlam, syphilis, diarrhea... That made me think 🙄
Not being the only bottom on an event clearly increases the risks, given most tops mount more than 1 bottom without thorough cleaning in between. And fucking with people from all around the world clearly expose us more than just sprawning with our neighborhood.