Same with a small company, as long as you have control of your domains and regular backups of the emails, having a fail-over isn't that hard. In this case the real damage is personal accounts, the business accounts could probably be up within a few hours at another provider (plus some more hours until backups are restored).
Bear in mind, if someone's all in with Google, they might have their domain controlled by Google Domains.
At one point I had my domain registered through my ISP, which was run rather eccentrically by a gentleman I eventually had a dispute with. He then (probably illegally) disabled all my DNS records, leaving me without my main email account for a week at a particularly vulnerable point in my life. It was horrific.