Sharing my personal experience and thoughts:
I started barebacking from the very introduction into and the beginning of my escapade to the world of relentless sex activity - I was underage at the time and have fucked quite a few holes ranging my age to late 40's before I came of age (16 years, here - in Israel).
This was in the late 90's to early 2000's.
At some points I have been on and off with condoms.
I'm a total top, but had given bottoming 4 chances - two of which were condom sex and the other two were bare - just to find out I didn't like it (my personal taste only! I love you all, my fellow BB bottoms!)
Since about 2006 I started leaning more towards bareback sex, and starting 2013 I decided to go bareback only.
The arrival of PrEP in Israel - in 2017, and its rapid adoption by the sexually "promiscuous" populations here, has made barebacking significantly more available, as the use of condoms among PrEP patients started to become very rare.
In Israel, we get sex-ed at school and at community clinics, and everyone is aware of the potential consequences of barebacking, despite the elimination the risk of HIV infection, but the pleasure of skin on skin, and for me, personally, the bare connection with my bottoms as I slide my dick in and out of their holes, and eventually shoot my loads inside them, is worth the risk of catching STD's.
I believe most barebackers in Israel feel the same about barebacking.
I'm not on PrEP, and never have been (please, no judgement and no lecturing. I have the right to make my own decisions as an adult of 40 yo), and my STD tally, after having fucked hundreds or more different holes) only stands on one case of throat Gono (I'm a big fan of giving rim jobs and blowjobs, and swallowing cum), and one case of penile Gono.
This might be one reason I'm so promiscuous.
Until early 2020, sexual health and PrEP habits were discussed before most of my sexual encounters, even at the baths, but after CoVid-19 restrictions were removed - around mid 2022, I noticed that these discussions were also removed off the table.
To me it was the understanding that even if what the parties to the encounter disclose is 100% true and reliable, there is absolutely no way to eliminate the risk of catching STD's, so I just go ahead and find bottoms I feel I can connect to, and have my fun time with them.
I also attend more anon action at the backrooms of the baths.
I know that I can only rely on myself, and that I have to take care of my own health - get tested regularly and if I happen to catch something - treat it, knowing the risk I am taking as I fuck around - the risk of catching STD's, not excluding HIV.
I do believe, however, that on the back of my mind, I assume that many bottoms I fuck nowadays are either Neg on PrEP or U = U, thanks to the availability of HIV treatment here.
And, while some bottoms disclose their Poz status after I breed them, the assumption that in the 2020's I am less exposed to HIV infection, makes it much more comfortable for me to slide it in no questions asked.
So, to conclude my own experience - PrEP did make bareback sex more available, for me, and even made it feel safer, although, as I already mentioned, I am not on PrEP.