* Azure: 12 user-facing outages this year so far. source: https://azure.microsoft.com/en-us/status/history/
* Amazon: They don't make their status history public it seems, but I see 5 easily searchable outages from last year. I would venture to bet their actual outage history is not any better than Azure or Google.
* Google: 23 from this year so far source: https://status.cloud.google.com/summary
These numbers are from when I counted in March 2019, so ~ 3 months, their outages are in double digits. That's TERRIBLE.
Obviously the above numbers are not across _all_ regions, they are just a total count across all regions.