[thwarted]

AirBNB can block them from renting out to other people for that time period

Then this opens up a competitive hole where another, similar service will let you rent on their platform during that same period. Hosts will just use multiple services (if they don't already), just like drivers for Uber and Lyft do.

In other words, this wouldn't actually solve any discrimination issues, but it does keep it hidden and off AirBNB.

[andrewprock]

Requiring apartment owners to use multiple services increases the cost of discrimination, which will in turn reduce it.