After starter bundle time is up, does it automatically charge for premium or do you have to manually cancel it?

Hey there!

The Starter tier is free forever. There's no time limit for it and as long as you stay on it, you'll never be charged. You can upgrade to an auto-renewing Premium subscription at any time (or pay for a Premium Code to prepay for Premium for some time and then automatically downgrade back to Starter afterwards). Whenever you're on Premium, you can downgrade back to Starter at any time to immediately stop any future charges. Anything you create is yours forever, regardless of whether you're on Starter or Premium.

Does that answer your question?

Thanks!