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Because it cost them less, and they magically "present" that it's a good thing. They pay different (lower/higher) salaries depending where you are located.

I kind of assumed they were trying to show that they are getting something right. I'm sure they have heard lots of criticism.

They do mention it being a great leg up on hiring competition, so there's that too.

It is the same as Basecamp. Marketing. Everyone hears about your company and knows you are all remote and so people want to work there. You can then pick and choose the best people from across the world.