What they are basically doing is making it an incentive to buy the Fold. Because if they applied the same trade in values to the other 9 Pro phones, people will probably consider the cheaper option. It appears that Google is wanting to get as many Fold devices in the hands of the early adopters. That won't happen if you can get the same trade in value on a 9 Pro XL because if people are balking at spending $1099 on the XL, they'll hesitate even further on a $1799 phone.It's a shame they do that; should just be even across the flagship phones really