Because the customer for Peloton has very little overlap with the customer for indoor cycling trainer.
There are tens of millions of people in USA alone with zero desire to bike outside, who nonetheless desire some exercise experience that requires minimal knowledge or planning outside of class time.
According to the information I got when I was hosting, Airbnb does punish hosts who reject a lot of guests by pushing the listing down in search results. The idea is that they want to show listings that are likely to convert to a match. Granted this might not help much if people of color only inquire occasionally, and everyone else is accepted