Why are we being penalized suddenly for paying with a credit card?

I have a banner when I log into my T-Mobile Account notifying me about it.  My bet is T-Mobile is paying to process payments and are trying not to pay them.  My cousins daughter just had to start charging 6% on all CC payments, or switch to another processing company. They could have switched to another processor, but especially for T-Mobile it'll be a big move.  Of course this is all speculation.  A lot of companies are starting to add a surcharge for CC payments.