That's simple. The government has always wanted to ban shit they don't control and doing so through the government is hard because of free speech laws. Furthermore, seeing how the government is likely involved with human trafficking and sex slavery, anything that has sex in it is likely an important target for them.
This might seem farfetched but in my experience sexual predators engage in projection to hide their guilt and seeing how the "feminist group" is completely fine with "Cuties" then I have my suspicions that they are just a manufactured excuse for credit card companies to ban shit.