Other Credit Card Programs - AMX SPG cap miles?

Does AMX cap the mount of miles you can earn in a annual period or is it unlimited?

American Express does not limit the amount of Starpoints that you can earn using the SPG credit card. Starwood limits the number of miles that can be transferred per day to each airline partner as explained here...

https://www.starwoodhotels.com/preferredguest/account/starpoints/transfer/airline_partner_list.html