I wouldn’t be surprised to learn this is a common occurrence across tech. Coming from the Midwest, the West Coast seems full of cults. Talking to people, it doesn’t take long to find someone who was raised in a cult, or has family members in a cult.
The post war boom years are a fertile time for cults in California. You had a lot of people who were isolated from their previous communities that were often easy marks for grifter run cults of all sorts. And not just California. But probably less visible in the Midwest with a less dynamic and conservative population.
Also: My definition of a cult is the question what happens when you try to leave?