Chargebacks can get your Google account locked. If you have a dispute with Google and protect yourself by reversing a credit card charge, Google might lock you entirely out of your account. The Google Pixel subreddit has a bunch of people's stories about that:
https://www.reddit.com/r/GooglePixel/search/?q=chargebackNot sure if this counts as "policy reason" for the article's purposes; he sort of dismisses payment disputes. I could argue either side about whether a suspension like this is reasonable. In the Google Pixel case the chargebacks mostly start because Google outsources hardware support to a bunch of unreliable third parties. Some of whom seem to eitiher lose or just be stealing customers' phones when they are sent in for repair.
My takeaway was that if I was ever in a dispute over a couple of hundred bucks for Google, I would not risk a chargeback for fear of retaliation. My account is one of Google's very first, when I worked there I launched one of the first products to ever use a Google account. I have no faith that as an outsider now I'd ever get a reasonable hearing over an account dispute.