The problem is you don't know if your card is going to be charged. It's too easy for companies to hide things in long terms of service click-throughs, or for u

The problem is you don't know if your card is going to be charged. It's too easy for companies to hide things in long terms of service click-throughs, or for users to misunderstand new services, or for companies to charge cards "by accident". I'm certainly pretty doubtful that I completely understand what I'm agreeing to with a new company. The simplest safest solution is to not give them your card.