I have a personal policy of not handing out my credit card info for any "free" trial. I work in finance and have seen too many people struggle to get stuff like that canceled. I don't give my credit card number to anybody unless I intend to pay them for something. To me, asking for that info for a free trial is bordering on shady. There is zero reason that they need to have that information for a free trial, they're just hoping they can get away with charging you for at least a month or two. I don't trust companies that set things up that way.