You're probably not going to go through the hassle of generating or applying for 1,000 credit cards in order to abuse some trial period on a SaaS service. Maybe

You're probably not going to go through the hassle of generating or applying for 1,000 credit cards in order to abuse some trial period on a SaaS service. Maybe you do it a few times. It's the automated bots that a CC prevents. Even with "free" credit cards or generated numbers, there's a lot of friction in going through that to abuse the service's trial period.