Maybe I am being cynical here, but one advantage of AWS is that when it goes down, the whole online world looks like it is on fire.
So if you have a database on AWS, and AWS goes down, you likely don't even need to tell your CEO that AWS is down, they already probably know that from the news or because their favorite website/app is also down.
However, if PlanetScale goes down, likely everything else appears to be working except yours.