That's okay, you have backup of your data, and you don't really depend on your Gmail account for anything important.

I’ve probably got about a thousand accounts that use a Gmail account as the associated email / username. I doubt this is uncommon compared to the number of people with custom domains.

The problem here wouldn't be the data but all the people whose only (or at least primary) way to reach you is the Gmail address.

So what? Why would you want to continue to use the services of a company you had to sue? That’s kind of a “burning the bridges” moment.

The whole problem is vendor lock in. Changing your email address if you’ve had it long is not straightforward or easy.