If your Tesla drives more milease as RoboTaxi, it will require more service.
The amount of service needed for cars will then increase significantly compared to the size of the fleet. We've not seen Tesla actually getting on top of service problems in any region where they hit, as far as I'm aware.
To deploy your car as a RoboTaxi at night when you need it in the morning every working day of the year, may prove to be a bad choice for owners. Tesla will profit either way, someone else will deploy a car to drive around. But will it actually work out for a large enough share of owners to grow to a signficant income generator?
Tesla in all their historical wisdom, expect to be on the road with RoboTaxi next year and seems to project a monopoly in the market for years to come. Should ANYONE achieve Level 5 though, it will be in their interest to make it work for ALL vehicles and remove themselves as production bottle neck. Say, Waymo gets to Level 5 and gets it approved for a significant region. Oh, there WILL be takers to create FSD kits for existing cars, as well as design new cars to ride he Waymo wave. Waymo operators would probably happily undercut RoboTaxi and this should be very easy. The hardware is not the worst expense and Waymo or its license taker could charge a much level percentage of ride fare.
The moment someone other than Tesla achieves approved Level 5, dozens of billions will flow in their direction. EVERYONE will be happy to develop tech to then be able to mass-produce it.
Tesla has a few hundred thousands of each Model S/3/X on the roads. There are SO MANY VW Golf/SEAT Iboza/Skoda Octavia kind of cars on the roads. Of some types there are millions. Well worth building a FSD retrofit for. And there will be many workshops happy to install it. It will be a huge business and all will be undercutting Tesla.
Why? Tesla makes premium long range vehicles. Long range is a nice to have (although not for Mother Nature), but not needed to deploy a FSD taxi at night. 200km of range is plenty to do urban taxi duty, especially if you only need to drive 10-15 miles to work in the morning. The car will charge to 160 km and hit the streets, back at 17.30 to pick you up from work. Having double or tripe the range is nice, but adds cost that is difficult or impossible to earn back. Especially if your car is a Tesla and it's being undercut by a VW that people will get into just as happily.
Would RoboTaxi get many rides at all once they turn out to not have a FSD monopoly?
In my opinion, Tesla should prepare to sell their FSD tech, try to be a leader there, not lean on their own fleet. If there's anything Tesla has proven to be terrible at, it's production. Quality AND quantity. In the BEV space they look great compared to half baked toes dipped into the waters. But when the big brands are ready and the Chinese join in...Tesla will be more of a Porsche than a Volkswagen Beetle.
Let's presume Tesla gets there first. It would be best for them and shareholders if they would sell hardware and software to others, to grow the Robotaxi fleet dozens of times quicker and be stronger against competition deploying cheaper cars. And they may be aiming for this or at least consider the option, as the name "Tesla" is not in the brand name.
I suppose a RoboTaxi company could split off and buy the IP rights from Tesla, good income for TSLA shareholders.
It will be much stronger in the fight against Waymo and the like as a separate company than part of Tesla Inc with all its drama and corporate nuttiness.