that sounds shit advice. I'm not a graphene user, but no, someone using it does not mean they are "overly privacy sensitive". the person saying this seems to be overly wanting to tell what everyone shoukd do.
another point is that if you're using an online service to pay, you are probably doing it because you are paying for an online thing, and in turn you can't pay with cash.
my 750 ti works. nouveau can't increase the clock speed to the operating clock on boot, on boot the display on that card shows random data with colorful pixels, and nvtop does not see it either, but it works.