If the hardware is already sitting in my garage, why pay for some other robot to tend the hedges.
Let's assume the attachment to your car (?) that trims your shrubbery or your robotic trimmer costs you $5k. You use it three hours a year. It could be trimming over 500 other people's shrubbery per year (assume 12 hour trim days, six month season). Allow the owner 100% markup to cover business expenses and profit. $10k / 500 = $20 per year. You don't have to worry about keeping the blades sharp and give up garage space.
$5k in an index fund returning 8% = $400.
I actually drove a cab once and know how passengers clean up after themselves.
If you call up a robotaxi the first thing you'll want to do is to take a quick look to see if the interior is clean. If not, punch a button on your phone and let the company know. If you live in a city or suburb they should be able to get a clean car to you in a very few minutes. They'll know who last used the car. They'll have the ability to charge them for the cleanup.
You'll be sure to do a quick check because you won't want to be charged for the mess you didn't make when the next user drops a dime.
Much of the car ownership thing was about bragging rights.
You could, instead, brag about the vacation you took or the four star meal you had with the money you saved by not owning a car. You could purchase a multi-hundred dollar purse and carry it out in front of you so that others can see the brand. As my sister-in-law does.
When Rex is driven to the park, then walked, and cleaned up after, by your RR Deluxe, with the Doggy Do Do option, the neighbor ladies will swoon. W
You could have a Rexmobile on schedule for every morning at 7:30 so that Rex is taken for his morning ritual while you eat breakfast. And then you could ride to the opera that evening in a robotaxi that didn't smell like Rex.
The heavily chromed hardtop convertible model that mixes frozen margaritas as you cruise the beach, then disappears and returns with a blanket, an umbrella and a box of Super Sized Condoms, will sell like hot cakes, or hot tamales depending on your local.
The heavily chromed convertible with built in bar and robo bartender will rent like hotcakes to those who are heading to the beach that day. You could be one of them.
Other days you may call for a pickup to move your fridge. Or a van to haul your latest IKEA treasures. Or a multiple passenger van so that you can take your neighborhood dance troupe to the Kecak competition. Or a robo-ride with lots of glass and an upscale audio system for your ride through the desert in bloom.
A chicken in every pot & a Rollin' Robbie in every garage.
(Invest in the companies that own the robo-rides. Then you'll be able to afford two chickens in every pot. And more pots. ;o)