Are primary red buttons a good option?

It's known that red buttons are mostly used for dangerous actions. This makes sense and it's all great. But then some big companies come and start using them as primary buttons.. And not just any companies, I'm talking about companies known for caring about user experience and design principles, like YouTube or Netflix. I googled it but found no explanation why they do this or any type of justification. Could someone elaborate on this? Or do we all agree that this is a "because they can" situation haha?