American Express has added new language to the Morgan Stanley Platinum card that now reads:
You may not be eligible to receive a welcome offer if you have or have had this Card, the Platinum Card®, the Platinum Card® from American Express Exclusively for Charles Schwab or previous versions of these Cards. You also may not be eligible to receive a welcome offer based on various factors, such as your history with credit card balance transfers, your history as an American Express Card Member, the number of credit cards that you have opened and closed and other factors. If you are not eligible for a welcome offer, we will notify you prior to processing your application so you have the option to withdraw your application.
Similar language was already on the vanilla version of the Platinum card and Charles Schwab card but this is new to Morgan Stanley. Hilton personal, business and Delta business cards are now the only ones that don’t have similar language. I’d expect that to be added soon on those cards as well unless there is something in the cobranded agreement that prevents it.