Yeah, having a threat intelligence and investigations team is very common for big companies.

If nothing else, it's probably safe to assume that someone like Mark Zuckerberg or Larry Page regularly get emails or other messages saying things like "im gunna go to ur house nd kill ur dog and ur hot wife"

Law enforcement doesn't have the resources to investigate every one of these, absent a credible threat of it actually happening, so corporate security / executive protection exists to, well, investigate.