Most designers use Macs, sure. But just giving a link to product owners, QA, clients, and developers is a whole lot easier than trying to get them to successfully use Zeplin or manually keep track of what static images I've copy/pasted in tickets etc.
Also: I use Mac at work and PC at home. So now you know one designer who uses Figma on PC.
Also: I use Mac at work and PC at home. So now you know one designer who uses Figma on PC.