Average taxi miles per year range from 30K (London) - 50K (New York). (Probably lower in more rural areas.) Robotaxis would be similar. Do your homework before spewing nonsense, people.
How Many Miles Does an Average Taxi Cab Driver Drive Yearly?
Taxi Driver Survey 2016 | Taxi Insurance
The problem, as people who have actually studied transportation know, is "rush hour". You can't get taxis, or personal cars, or buses, or trains, full 24 hours a day because the demand simply isn't there 24 hours a day. And we actually know the demand pattern.
The only way to change that is staggered shifts and people *hate* staggered shifts.
Anyway, those are some actual numbers to use when making projections related to any taxi market.