For most things being sold you'll want an account attached. If this is a song or a book then you probably want to at least have functionality like reviews, ratings and recommendations.
Whatever it is that you're selling probably forms part of some sort of established relationship -- I don't recall ever getting out my credit card and paying $5 for something from a random link on Twitter.
It also seems abuse prone. If we're supposed to share these paid links, that creates an incentive for scammers and trolls to create their own links and get people's money while delivering nothing. That means customers will lose confidence in the system, vendors will get screwed, and the company will be hit with chargebacks. This seems like a dangerous business model.
For the vendor side, this seems to be a redirector, so once the first person pays, they can share the URL they got redirected to. This doesn't seem like a good business plan.
EDIT: I just got one to load. This is all I get:
"This link costs $15.00 to access. You are trying to accessed a link through PaidLink.to, which requires payment to proceed. Fill out your payment details below."
What the heck am I even paying $15 for? I haven't a clue. Not only there's no preview, there's not even a description!
Screenshot for anyone having issues: https://imgur.com/YIsypEN