Combustion cars were already usable even on the roads built for horse drawn carriages - they were, in fact, adapted to the existing world.

They even ran on things like firewood, coal, or, for the first ICEs, relatively common liquid fuels that could be sourced in large cities.

Cars rely on gas stations today - but gas stations only became a thing after cars already became a thing.

Nowadays, Tesla had to make Superchargers happen all by themselves before EVs could really happen - despite EVs already having the crushing advantage of being able to charge overnight in any garage that has power.

Can you see a robot company branching out to be a competitor to McDonalds to prove that their kitchen robot is viable if you design the entire kitchen for it? Well, it's not entirely impossible, but I think it unlikely.