My 5 cents. Regardless if this is Apple or any developer, subscription service etc., I consider giving my credit card number / paypal for testing any trial software as directly abusive.

Maybe, it is just me but from my perspective this is a try to force buying from me by whatever means possible and doing me is like rejecting me as a potential customer: I will just never do it.

I hate the need of thinking about some money will be taken from me, unless I perform some action - I consider it as a huge violation of my trust as a highly fishy tactic.