I really should’ve used an alt for this but well uh
you not be looking niche enough
in my experience the niche content on mainstream sites tends to be generic meaningless content made primarily by uh, creators who aren’t actually in the community but are just dabbling around. When people in alternate communities do post there, it’s often as a front for people to find them, likely a limited selection and/or the individual pieces also limited, and link back to other sites where their actual (often paid) stuff is
even if you do find it, there’s obviously a lot less so people are more willing to pay for it