They actually only charge 1% commission as the selling agent now, too, so vs a typical 6% combined commission, they save 33% for the seller. (Assuming just a sale)

Redfin doesn't seem to disclose how they calculate the refund anymore, though, so I'm not sure how much that works out to be. Seems to be around half a percent, so lower than it used to be.

All combined, it's close to half of the traditional fees that they either refund or don't collect.