Number of apps available in leading app stores 2019 Google Play: 2,470,000 Apple App Store: 1,800,000 Windows Store: 669,000 Amazon Appstore: 487,000 Likely hood all, a majority, a minority or even a tiny percentage of App developers will do the right thing? Close to zero. How many Apps are written in other countries, and don't follow requirements across borders. Its not even a hypothetical, we know this from experience with cellular telephones in the early 2000s. The cellular industry and mobile device OEMs claimed for 10 years that they should NOT supply emergency alerts, because all the Apps would do that. The cell phone was "just the platform...." Didn't happen. There were a few, very few apps, which implemented alerts; but default settings is a powerful thing. Almost none of the public installed or used them. Even when cell telephone companies isntalled alert apps by default, they failed to maintain them and often didn't work when needed. Eventually, Congress passed the AWARN legislation requiring cell phone operators and manufacturers to implement emergency alerts. A subscriber can opt-out, but by default all cellular telephone OEMs and OSs must implement emergency alerts. A decade later, Netflix, Hulu, Spotify or whatever App you are using on your phone still rarely implement alerts. Wireless Emergency Alerts are nearly always triggered by the base cell phone operating system. Amazon Alexa (echo operating system), Google Assistant (Google home/nest operating system), etc. are avoiding it much like the old cell phone OEMs in the mid-2000s. But eventually I expect there will be a disaster, and lots of people won't get warnings, and will die. Cable TV operators fought implementing EBS/EAS through the 1980s. Cable TV didn't have EBS/EAS, and several hundred people died watching premium cable in the midwest and didn't get the tornado warnings being broadcast by the local TV stations. A few years later, Congress passed the law requiring Cable TV operators to implement EAS/EBS. Much like seatbelts and car manufacturers, I expect tech firms to dodge as long as possible. I appreciate your belief that somehow industry will do the right thing on its own. History isn't on your side. I do not expect Apple, Amazon or Google to do something until forced too.