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.
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.
I can see why they blocked it.