Sure, in kind of the same way that steam has a conflict of interest with reviews for games. But I tend to trust steam reviews at least generally, in fact more than I do most reviews on products I am looking at.

It is possible to exist in this space with a potential conflict, as long as you position yourself appropriately. If your interest is to serve "decent" companies by providing them with interested candidates, it can work.

It'll work fine until the site decides chasing profit is more important than integrity of the system, so probably right around the time they're looking for more funding.