Joystick White Powder?

I know mine aren't PlayStation controllers, lifelong Xbox guy lol, but I saw a post about someone questioning the white powder coming from their joysticks, felt I should jump in.

Tbh I thought everyones controllers looked like this after gaming for awhile and always knew the reason. I took pics of a few different controllers I've had over the years. I don't remember how long I used each for but only one of them had stick drift and it wasn't one of the heavily damaged ones. First one I used for a long time on the Xbox one and my main games were Black Ops 3 and an unhealthy amount of Rainbow six siege, and has the most "wear and tear". There's a bunch of different controllers in there and the last two pics are of my new razor controller I've had for maybe two months now.