Even without "all-servers", DNSMasq will race servers frequently (after 20 seconds, unless it's changed), and when retrying. A sudden outage should only affect you for a few seconds, if at all.
Yeah it's not like they have a long track record of being caught red-handed stepping all over privacy regulations and snarfing up user activity data across their entire range of free products...
Wellp. Incident report: "We posted our first incident report to Cloud Service Health about ~1h after the start of the crashes, due to the Cloud Service Health infrastructure being down due to this outage."
Maybe not the entire region. Amazon was reportedly building a data center complex next to the natural gas Hermiston Generating Plant some distance from the river.