I am a bit concerned about this, but I also don't want to use a location-spoofer with Netflix. With AdFreeTime, there is a setting for Netflix location spoofing, and it is turned-off by default. Indeed, they have a lengthy post on Reddit about Netflix and its recent stance on location spoofing. So I simply leave that setting off, and there is no issue.
did you find it is easy to cancel ad-free time? just in case this doesn't work the way I was hoping.