Amazon can apparently go up or down 50% depending on whether a butterfly sneezes in Australia (it's wildly danced between 284 and 580 in the past 12 months alone).
In the background of such high volatility, it would be hard to pinpoint such a material effect from such a small disruption (in the big picture of course, I'm betting there are some pretty angry customers today due to the loss of a few sigma of reliability from this outage alone).
Now if a study were published indicating customers were switching providers over incidents this, then I think you'd have some material evidence. But is anyone else better yet? Azure was out for 12 hours last year apparently...