Comment by Itaxpica

Yes, though exactly why depends on the jurisdiction. In some areas a tenant blacklists is explicitly illegal; in others this would fall afoul of credit monitoring registration laws. Additionally the fact that they're using AI opens the door for a lot of issues; for example, if it turns out that their blacklist flags a disproportionately large share of African-American renters they're on the wrong side of fair housing and anti-redlining laws.