Billing addresses are not needed at all. In other carts, you can exclude them all together. The only thing that's needed is a zip code and that can be added near the CC number (or if they use Link it's automatically poplulated).

There are other posts requesting this feature including mine (skip checkout for free courses and set content access expiration date) which has 22 votes. So there are at least 28 people or more asking for this. Please strongly consider implementing. Thank you!

I would really like this option too as I will use free courses as Freebies to get people to sign up for my app and use it and I need it to be as smooth as possible. But if the same user then later buys something then he will need to fill in his address for tax purposes.