There's a number of titles leaving Xbox Game Pass this month, but in the case of Forza Horizon 4, if you don't buy it now it's gone for good.

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access information on a device and to provide personalised ads and content, ad and content measurement, audience insights and product development. List of Partners (vendors)

Xbox giveth and Xbox taketh away. November saw some big names come to the Game Pass subscription service, like Stalker 2, Flight Simulator 2024, and Aliens: Dark Descent, but December sees some some real bangers removed.