I've never used Auth0 and I've never heard of FusionAuth :)
Okay, it's not entirely true that I've never used Auth0, I skimmed over the docs... but the main idea of my article is that no matter which service or 3rd party plugins you use if an outage can happen it will happen eventually.
Ákos Kőműves
Full-Stack Developer and Writer
I’ve been there - except for deleting a client db 😅 When I design apps I always tell the clients the downsides of using a distributed solution, ie. Auth0 instead of going with a local solution such as FusionAuth. Thanks to these incidents you mentioned, more people realize the downside of such solutions and are actually happier going with an alternative.