Earlier quoted context omitted.
"You can then use the virtual credit card to signup for free trials on the web and on apps without worry. We approve only free trials and not actual purchases." I assume when you sign up to a free trail, they'll charge your card £0.00 to confirm it's a valid card, then when the trail ends and they try to automatically charge you for a full subscription they'll block the transaction. https://justuseapp.com/free-trial-…
This is not the intended use for stripe issuing at all, and would lead to stripe handling thousands of disputes from companies trying to charge cards with 0 balance after trials end. I can see why they blocked it.
Automatically charging a 12 month subscription after a free trail is not the intended consequence of signing up to a free trail for most people at all.
It leads to thousands of disputes from innocent people being changed a lot of money they never intended to part with, sadly most will never get that money back.