There was a video he did on a startup taxi service using self driving cars. Basically the entire thing was an advertisement for that company.
Then another Youtuber, Tom Nicholas, released a video about that a few months later and how it’s an issue. I’ll have to watch it again as I don’t remember what he specifically talks about.
Titanium is awesome, though. Has similar corrosion properties to aluminum (in that it only oxidizes on the surface), is similar in strength to iron/steel, but is only about 60% of the weight iron. So it’s lighter.
Plus if you mix in molybdenum and I think some nickel, you can have yourself a very long lasting spring that won’t sag like steel springs after several years.
Main downside is it’s so expensive compared to iron :(