Re: Going from AMEX Green to Platinum. Does it make sense?
It's similar to the MB & MS Platinums in they are co-branded Platinums with additional perks and some other small changes depending on which one you're comparing to the standard Platinum. You can compare using:
Can you apply for that $0 Ameriprise version even if you have no assocatiation with them?
From the link I provided:
Your ability to have this Card product is contingent on a relationship between you and Ameriprise Financial, Inc. If no relationship exists, or if your relationship with Ameriprise Financial ends, American Express has the right to cancel your Card account or transfer your account to another American Express Card product that will have different features and benefits.
just with the $0 annual fee?
There is an AF. Also from the link provided:
$0 introductory annual fee for the first year, then $450.