Update (5/22): Ubisoft has dismissed its complaint following Area F2's removal from sale. It sent the following statement:
“Ubisoft is pleased that Area F2 has been removed from sale by Ejoy.com. As a consequence we have decided to dismiss the complaint made against Ejoy.com, Apple and Google. Moving forward we remain committed to protecting all of our intellectual property and the hard work of our teams.”
Original story (5/20): When a mobile game that closely resembled Rainbow Six Siege appeared on Google and Apple's app stores, Ubisoft aimed its lawyers at both companies along with the game's developer, Alibaba-owned Ejoy.
Similarly-designed games can exist without infringing on each other's copyrights or trademarks (think of all the Auto Chess variants), so the resemblance has to be egregious to warrant a lawsuit. In this case, Ubisoft argued that Area F2 resembled Siege so closely that the average consumer could mistake one for the other.
As demonstrated in the video from Throw Central embedded at the top of this article, Area F2 does look a hell of a lot like Siege—or at least a mobile version of it. Whether someone would assume that it was made by Ubisoft is debatable, but Ejoy either didn't think it could win that debate, or decided it wasn't worth the expense.
The developer did leave room for a return, though. "We are carrying out improvements to Area F2 in order to deliver a better experience to players," it wrote in a Facebook update. Perhaps Area F2 will return with artwork and an interface that are less obviously Siege-lite?
Ignoring the legal issue, it is pretty cool that even a bad-looking version of Siege can be made for mobile devices these days. How far we've come since I was playing Snake on my Motorola Razr in college.