So I just registered for this promotion and it is exactly as advertised, Double Points starting with the second stay between March 19th and June 4th, registration required by May 21st. However, there is a (fairly minor) bonus that I find curious. It is called Earn Even More and holders of U.S. Bonvoy credit cards get a 500 point bonus on weekend stays. The fine print includes requirements that the credit card account is in good standing and linked to the Bonvoy account, but doesn't seem to require that the credit card is actually used for the stay, which is a bit strange to me. Thoughts? Did I miss some fine print?