Unfortunately (or fortunately as your opinion runs) .. Carpet baggers are going to carpet bag. Wherever there is money - people will show up to exploit customers by whichever way they can...
There is no internal policing within Christianity regarding posting it's logos or marks on your stuff.. There is also neither an association which owns the trademark on the logos nor a government agency which polices it's use...
As such - you have to treat these marks just like any other marks that bear no commercial certification/regulation..