Where do you think the peer pressure and beauty standards came from? It was those wacko doctors. To the point where it became "what you do". Modern commercialization of medicine is unrelated. It became what Americans do when their infant has a dick. Most Americans just did it. Speaking as an American who had a foreskin and who has dated multiple anti circumcision activists, I seriously can't emphasize enough how much it's just autopilot for everyone. There's no marketing cabal of the medical establishment to push circumcision to make money, its just that very few of the doctors that have dicks have foreskins, very few of the patients' fathers have them either, and if given a flat question, very few of the patients are going to leave with one. And that culture of circumcision came from an era where the main goal was to stop masturbation because it was seen as leading to mental illness.

And Wikipedia isn't an academic source, it's one of the absolute best "here's what seems to be known" sources for casual understanding because it's curated and shows it's sources. No encyclopedia is an acceptable source in academics. And I'm also aware that my personal experiences don't count as a rigorous source.