[dahdum]

I'd just make a backup AWS account with separate billing before I worked on multi-cloud.

[sparrish]

That's short-sighted and poor engineering. You need your service to be able to keep going no matter what any single vendor does. Never intentionally create a single point of failure like that.

[Trencin]

Could work, but if you're being targeted for some reason it's likely they would find your other account.