> It must be much harder than I first thought, but then again they spent BILLIONS on this.

Which is why MS and every other company keeps pushing half-baked garbage AI products onto the public at every opportunity. So much money has been sunk into AI that they need something to show for it. They also hope that as people use it they can improve the AI they have so that maybe one day it can become something worthwhile. As a bonus it's one more way for them to collect your data and get you used to asking an AI for what you need instead of using your brain.