I received one of those ' we are writing to provide you with an important notice regarding the above referenced account.'
Most of the time I quickly look at these things and toss them in the shredder.
One of the changes was that 'person to person' transactions are not eligible to earn rewards. So, wonder who was making out on that??
Next was that a whole group of cash equivalents will now be considered as cash advances. Travelers Cheques, gift cheques, (their spelling not mine), foreign currency, money orders, digital currency, casino chips, race track wagers, precious metal coins, bullion, digital precious metal products.
I don't know if all these things created rewards for the purchaser or if they were already cash advances on other cards, but the only thing that I would possibly purchase with a credit card would have been a money order if required. Just found it to be an interesting notice in the context of churning.