It depends on a lot.
This is something I miss sometimes when people ask for something specific, and we have to speculate on a thousand reasons.
I feel there are plenty of opportunities by sharing sites if they are not particularly focused in any specific super-profitable-blue-ocean-niche-that-is-better-not-to-share
Personally, I've been built on that mindset, and sometimes I feel slightly awkward when someone asks me for the url and I prefer not to for no specific good reason (just because of having this mindset so extremely engrained)