“Stud Card”: How to See Increased Sign-up Bonuses from AmEx (via Incognito Mode) from Referral Links (2020.2 Update: No Longer A Valid Concept)
2020.2 Update: It seems the concept of “stud card” is no longer valid. All amex cards have the same effect now. 2019.5 Update: According to data points on reddit, AmEx Biz Gold and Biz Platinum now become “stud cards” as well. They have the highest referral bonuses, so if you have them, they are the best cards to generate referral…
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