You want almost free games on xbox one? Follow those steps: do a one month subscription to game pass (first time is free). Download all the games you may be interested in, disconnect the xbox one from the network (disconnect the ethernet cable or cancel the wifi password) and then you can enjoy the games for months after the subscription has expired. The trick is: when you power down the xbox one also disconnect the power plug; the xbox one doesn't have an rtc and he doesn't know what time it is. If you disconnect the main plug he will reset the clock to the launch year. Whan you want more games connect again to the network, create a new online user and use the special 1 month free offer for gamepass.
I suppose that to work currently is a great method. One question, assuming it works, can you download the games you want or only a limited number?