It's high compared to the general population. https://www.ibsf.org/en/athletes?nationality=CAN&gender=M&la... lists all make national team members going back to at least 2010. There are less than 500 national team members listed between the US and Canada. 3 deaths / (500 people *7 years) is 85 deaths per 100000 person years. The normal us rate is closer to 27.
That being said, I agree it would be interesting to know if other speed sports have similarly elevated risks or if it is unique to bobsleigh
The suicide rate among British men is 1.07 per cent, but according to Frith's research, the rate among cricketers here is 1.77 per cent - making them 75 per cent more likely to take their own life.
But the game's toll overseas is even higher. In South Africa 4.12 per cent of players take their own lives. In New Zealand the rate is 3.92 per cent and in Australia 2.75 per cent.
3 athletes in 7 years in one sport doesn't seem out of ordinary in extremely stressful environment where each millisecond counts