[nerdponx]

They do, although most listings are from an MLS.

I think they might also offer some kind of paid/pro tools for individual owner-sellers and agents who might want to use them.

They also do business on the buyer side too, where they connect you with local buying agents (in a kind of misleading way, making you think you're booking an offer) and presumably impose some kind of commission for that.

And who knows who they're selling aggregated user data to.