Bigme has been a player in the niche eink tablet market for a while now, so it's likely real, or at least not a complete scam. The fake marketing videos in the Kickstarter are atrocious, though. I would say Dasung and Onyx Mira are the popular brands for eink monitors. If you only want greyscale, those two have decent options available today. It seems like this larger color eink panel just became available, which is why you see both Dasung and Bigme building products around it now.