Why are so many MasterCard cards 2% back structures?

[Clegga]

I had noticed that a lot of the cards that offer a flat 2% back happen to be MasterCards, such as the Citi double cash, the SoFi card, the PayPal card, the Ollo card. Any thoughts? Other examples?

[Anonymous]

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@Clegga wrote:

I had noticed that a lot of the cards that offer a flat 2% back happen to be MasterCards, such as the Citi double cash, the SoFi card, the PayPal card, the Ollo card. Any thoughts? Other examples?

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See https://ficoforums.myfico.com/t5/Credit-Cards/2-3-Cashback-CB-Credit-Card-CC-List/td-p/6197473

OP in post 1 had the same observation, and then noted it's just not the case!

[Shooting-For-800]

Synchrony Premier (see sig) is 2% no fee card.