Anyone working deep in this kind of tech is basically doing a dream job. Despite heavy stress, you get to push the boundaries of your field and work with exciting new tech, and you get paid so well too! ... Until the money stops, which it will at any moment when the investors get scared. So, without really even trying to you become dishonest, you start to stretch truth a little, get a little too optimistic in your estimates. "No no please, just one more year of funding, 6 months, and we'll have world changing results" and then you just need to get an impressive demo together and try to keep kicking that can down the road.