I take the opposite approach and almost always finish the full interview. They took the time out of their day to do this and it at least gives them practice. It also leaves the company you're repping in a better light imo
Take a job with a lesser title / pay but in exchange get exposure to the new tech you want. Do that for a year or two and the next position you'll be back on par.
Front running is illegal indeed. But it would be possible to use Robinhood's order flow data to detect momentum and decide to hold a position from that. Small difference but the effect is the same