That's pretty much how all concept demos work at start. At some point they might actually do the thing, but need a lot of careful setup and pushing along. Later on, they start to work for some cases, then more cases and hopefully before they go in the field there's certainty and fault handling that they more or less work.
How honest the marketing is about this process and their market research varies. But investors generally know how the sausage is made, too.
A kind of https://en.wikipedia.org/wiki/Poisoning_the_well tactic that seems to be common in the comments. Some accounts seem to constantly be labelling all of Lemmy as this or that extremist thing.
Yes. Whether it's rewarding or profitable or safe will vary wildly with where and when and who knows what. There may also be license requirements and in some places you'll need to drive a truck or something professionally before you are allowed to drive a bus. And any work with children may have extra requirements. Either way, it's customer service and a lot of techs consider that the most stressful thing there is.
Worth looking into, though, if there's any chance you might like it.
Edit: Oh, and traffic! I hate traffic. I can't imagine having to pilot a bus in traffic. I don't know how I forgot to mention that.
Ah, the old Shady Sands Shuffle.