https://www.gamespot.com/articles/rainbow-six-siege-is-free-to-play-on-pc-ps4-and-xb/1100-6456810/

As promised, Ubisoft has launched a free weekend event for Rainbow Six Siege on all platforms. Those on PS4, Xbox One, and PC can try out the full version of the excellent game, albeit with a caveat in the case of the PS4 version.