ProFinder was a US pilot project to test LinkedIn's hypothesis that 3% of any given market will buy at any given time. The 3% always have a pain, a budget, and are ready to purchasing decision.
After refining and fine-tuning for 7+ years, LinkedIn has successfully concluded that the 3% will always buy after COVID. Hence, they've rebranded ProFinder to LinkedIn Marketplace. Attached is the visual depicting the pyramid of the 3% of the total buying population. The second attachment is the screenshot showing ProFinder in action back then.