I can see myself recommending business that describes itself by mentioning OnlyFans to my friends, I can't see myself recommending the business to my family or coworkers.
I personally don't think there is anything wrong with "Onlyfans for stock trading", but I think "Patreon for stock trading" is a more general-public-palpable option, and fits just as well.
What are your thoughts on "Substack for Investing".