At least a totally separate account. Probably better to use a totally separate set of IP addresses and browsers and maybe even computers. Google will definitely link accounts created from the same browser and potentially ban your main account if you violate their TOS on another account also owned by you.

This is a complete hack job and probably useless if Google changes free storage for docs.

That being said, they currently allow the guys at /r/datahoarder to use gsuite accounts costing £1 for life with unlimited storage quotas. These are regularly filled to like 50TB and Google doesn't bat an eye.

As a data hoarder myself with somewhere around 300TB on G Suite Business, please tell me more about those £1 for life accounts!

Search them up on ebay! Loads of IT admins for schools sell a random email with you. Pretty scammy.

I'm kinda scared to try it since google could mass ban all of the accounts if they want to, but sure is a great job from the dev.

I didn't know this was plausible.