Marbles rise my APR

Spark

I just got a letter with my last Marbles statement telling me that my Annual Interest Rate for balances transfers and purchases will rise from 9.9% to 12.9%. When I got my Marbles credit card, it was at 7.9%, then 9.9%, now it will be at 12.9%.
Is it a general trend in the credit card business to rise the APRs or is it just Marbles who decides that a rise per year is in order?
And is the rise for all Marbles customers or do they pick and chose which ones will get the rise and which ones won't?

redeye_3

Mine went from 11.9 to 14.9 just last week