I don't think a cleaning robot and a vehicle are in the same category, as vehicles are more a necessity (at the very least to get to and from your jobs, to buy groceries, etc) and a cleaning robot is squarely a luxury.

A car saves you time walking/biking, a robot saves chore time. Depending on depreciation, it's feasible that you could go do minimum-wage level work on Doordash using the chore time you save from the robot and still come out ahead. E.g. 5 hours/week at $20/hour = $5200/yr