(Googler, opinions are my own. I work on payments.)
Gmail is Gmail only, for everything else create separate Google accounts you are not afraid to lose.
IIRC a company got their project booted from the play store, because one of the developers accounts got a black mark.
In any case, I am in the process of migrating off Gmail too, it just takes a lot of effort. But to your point, I should probably also download all my gmail data and archive it just in case.
Chargebacks are the mutually assured destruction of banking. There’s nothing wrong with firing a nuclear weapon if you truly feel it’s in your best interests; if you do, expect that your adversary will respond in kind and terminate all business with you now and in the future.
Sometimes that’s the right move, sometimes it’s not, just go into it with eyes open.
I doubt Google would send anyone to collections in these circumstances. But - Careful what you wish for!
Also, if you see charges from Google on one of your cards but wasn't on your profile, I recommend following this guide: https://support.google.com/googleplay/answer/2851610?hl=en
Plenty of these stories:
https://www.reddit.com/r/tifu/comments/zndbku/tifu_by_accide...
I’ve heard people following this advice really regret it because they don’t realize how much ties to google. Please make sure folks you are advising understand this.