I mean really you click the donate button and u get those options and specifically VISA/MASTER CARD which asks you for all of your card info just like that it just feels like i am freely giving my card info to the internet.
MY questions are :
What makes it a safe way ?
What is guarding all of your info ?
Have you done it and did you have any problems after ?
I dont really know what makes it safe but I have used that way for donation many times and have donated to molten/warmane since 2012 with the same card have never had any problems.