1.. Buy fully autonomous car

2.. rent it out as an autonomous cab

3.. use an autonomous cab to get around

4.. ???????

5.. Profit

It's a matter of who owns the resource, and your current state assumption is what oligarchs want to change.

Just like PCs, they will structure it so you won't be able to afford one. For vehicles they'll use the insurance industry as a wedge as well, and as more and more people lease/rent their vehicle with included insurance(this will be one of the talking points for the owners class selling you one), those trying to not have a rent payment will see their premiums ever increase.

Think about how insane car prices have gotten ecen for used vehicles in the last few years--and It's not improving even though all the "supply chain" issues attributed to COVID have long ended. It's the same system phenomenon that happens in gentrifying areas with the existing minorities; property values go up, as do property taxes and even long-time residents who own their home free and clear can't afford the property tax increases--it snowballs into additional gentrification.