Being on AWS is also easy to explain to customers about downtimes - AWS was down and customers are pretty understanding in that case and don't demand why you aren't multi AZ etc ( of course YMMV based on sensitivity of your business)
If Netflix can go down when AWS goes down, so can your app. AWS outages impact so much of the Internet that people will just accept it.
Of course here I am with a site on Heroku which uses AWS... impacted by the AWS outage... fielding questions about why I didn't pick AWS if Heroku suffers outages like this. Can't please them all.
So your statement relies on customer ignorance.
We got lucky this time, RDS, ELB, EC2 and Lightsail instances all in US-East-1 across multiple accounts and no issues (knock-on-wood and understand that we'll get it the next time). Especially happy as I had a two-day running neural net training job running and it's still going, that would have been depressing. Phew.