Just did a quick check around my office (Fintech company)(mostly 25-35) and no one had heard of it.
So yeah, I don't think it's that commonly used.
Also, I don't think fintech is anywhere remotely close to "an average consumer" population to judge whether or not tabloid/instagram relationship applies to large swaths of people.
Stan-ing is very much a common term for Gen-z. And they have stan accounts. And I sort of get it. :)
This happens gradually, but started in full force at my house around age 15.
I have 3 boys, 13-18. It's an incredible amount of fun.
Definitely would not be surprised if a disproportionately large number of HN readers in Fintech have never heard of it lol
In past generations the mode was likely also the majority