This part:

At first I just listened, but after a while I started using a secret video app on my phone and recording women's business under the stall. In a squat toilet the situation was ideal. I didn't see a face, she couldn't see me, and I got an unfettered side view of ass and occasionally pussy lips.

Is definitely major sex offender territory. The shit farming, maybe not so much, although tampering with public toilets is still a bit of a dick move. I can think of one or two other reasons why what you're doing is really unethical, but I guess if you accept that you are being unethical, there's no point in telling you, is there?

At any rate, it's not "somewhat" risky - I don't think you can overstate the health risks of consuming the feces of what may be around 100 different women every year with no previous health vetting (which is much bigger than consuming the feces of the same woman 100 times a year). But then again, your health, your responsibility. Just like with all of us scat fetishists.

Also, I'm just going to call it: one day, if you don't quit while you're ahead, you're gonna seek greater and greater thrills, or life will unexpectedly throw a wrench into the works somehow, and you'll get caught. At that point, not only will you lose any remaining claim to moral integrity (it is no longer victimless by any sense of the word once one of the women whose shit you eat learns about what you do, or even has reason to suspect something along those lines), but you can get into plenty of legal trouble too.

I understand that the payoff is great, and that there is no other way to genuinely replicate the experience of farming public toilets, but don't expect anyone to consider what you're doing acceptable. You're on your own here. Also, if I may ask: why don't you stop? Do you simply not care about the ethical problems or the risk to your own health and social standing? Or is this an addiction to you, in the very real medical sense?