Ask HN: What computer vision datasets is the world missing?

I know there are a lot of datasets out there, some are restricted based on their license (non commercial). There are a lot of generic items but when you get to niche applications there are fewer.

I'd personally like to see a dataset for billiards. That would enable an AR app that helps you find shots. While a little morbid, I also think an active shooter dataset would be very valuable. Something from security camera angles to identify people with weapons.