I have been to the doctor's office of a very reputable university, with a very reputable doctor, one of the most cited in these forums, who's written lots of papers and which I consider very knowledgeable, but stopped going there because he will dedicate less than 5 min talking to me, he will have the answers before knowing the questions, and he will also use a compounding pharmacy for everything, even when I had insurance. I asked him if he could send the prescription to CVS and he told me "we don't use CVS, we only use our pharmacy" (one of the big compounding pharmacies everyone talks about).
By the way, my doctor seems very reasonable and knowledgeable on YouTube, and I don't question his credentials at all, just his practice. I have read all of his papers, they are all very interesting and thought provoking. I just wished he were with me in person the same way he's on YouTube.
So it seems to me at least, that nowadays pretty much everybody is a pill mill when it comes to testosterone and male sexual health. Little risk, big rewards. The main difference between a more reputable doctor's office and a T mill (which are typically not run by doctors) is that a true doctor may be more conservative with dosages and may not start people on 200 mg/week and Anastrazole and Clomid right off the bat. They may usually start with 100 mg a week and as long as you are between 500-900 ng/dL they will treat you, they probably won't case how you feel, but if the numbers right, they are good. T-Mills usually want a trough of 1200 ng/dl or above.
I asked my PCP for example if they did TRT, he said yes, but they require you go to the office to get a shot, so he advised me I continue what I was doing because it was cheaper. At least he was honest.
I recently change to another Andrologist in another reputable hospital that I consider my "drug dealer" because I give him the protocol and he fills the prescription, but it is me who puts all the rationale behind the treatment, he simply agrees. On the bright side, he uses any pharmacy I ask him, so I manage my costs.
Your mileage may vary. That's my experience.