Or gay people doing trains

I doubt they're making that data set, but local government might use the gay data to approve a gay club, or include more or less health information for those sexualities in places where's they provide such

They might use method to get to work numbers by region to see which places are doing public transit better so poor performing localities can more easily see how to improve

For the last 25 years they have kept the data for release in 99 years. Unlike other places you can opt out of having your data stored and released