It's far fetched but not impossible. Rio is already extremely dangerous compared to SF, with gangs committing mass robbery, home invasions, shootings, and kidna

It's far fetched but not impossible. Rio is already extremely dangerous compared to SF, with gangs committing mass robbery, home invasions, shootings, and kidnappings. More likely a much more benign gamification will ensue in the US: homeless people will learn they can extort money from passengers of self driving vehicles in exchange for not delaying them with cones, physically blocking them, or whatever. I'd look at it as karma or recompense from a society that doesn't meet the basic needs of all people.