Amtrak Guest Rewards is notorious for unannounced changes to both partners and to material features of the program. The "enhancements" are followed with terrible communication about the changes and general confusion.

Most recently, around May, they suddenly forbid redemption of non-Amtrak rewards to Select members and AGR credit card holders. Then, again without any notice, members could no longer simply HAVE the credit card to redeem non-Amtrak rewards, but also must spend $200 per year on Amtrak travel.