Yeah, for a similar vendor, it's interesting to read this page and look at the diagram:

https://auth0.com/availability-trust

And then read this tweet:

https://twitter.com/auth0/status/1471159935597793290

Edit: Ah, seems they picked us-west-1 and us-west-2 as the two regions..."In this case, we use two AWS regions: us-west-2 (our primary) and us-west-1 (our failover)."[1] So bit by a double-region failure.

[1] https://auth0.com/blog/auth0-architecture-running-in-multipl...