There are some proverbs, because it's a very old observation. But there must be named laws too, because it's a very common observation.
> There must be some named law that states that the set of people you listen determine most of your thoughts. But it's something way wider in scope than Conway's Law.
A related term is "audience capture". When you do things based on the approval of your followers, you can end up catering to some weird niches.
> If you’ve ever wondered why so much of the creator economy looks like a pyramid scheme—with course creators who teach other creators how to sell courses to creators who eventually sell their own courses on course creation to other unsuspecting creators—mimesis is at the heart of the matter.
From his article: The Ungated Manifesto: The Pattern, and the Battle for the Soul of the Internet.