I just switched to FastMail a few weeks ago with my own domains to move away from Google, to prevent this vary possibility.
I realize how screwed I am if my email carrier arbitrarily decides to cut me off. Haven’t changed every account, but I started with my bank/financial accounts, and basically intend to change them over time; every time I log into an account for something, I plan to change it.
Edit: Of course, not an advert for FastMail. They are simply who I choose; I own the domains, so I can easily switch to another provider in the future if I so choose without cutting off my accounts. I know more privacy focused people tend to prefer Proton Mail or Tuta Mail. I’m fine with the choices fastmail makes in comparison to the other providers, for the specific features they are able to offer for giving up E2E encryption, a reasonably price family plan, and some more generous offering for value/price.
If someone requires the extra privacy, for sure go for another provider.