The point of the study in proposed bill is customers of Netflix and Spotify (just to pick on them because everyone seems too) watching videos on "Smart TVs" or listening on "Smart Speakers" may not realize those devices won't get emergency alerts like their old-fashion AM/FM radios and over-the-air TVs. If Netflix or Spotify customers are watching or listening on their "Smart Phones", they do get emergency alerts from the cell phone provider.
I haven't used an "over-the-air" TV in fifty years ...
Much like watching Netflix and listening to Spotify on smart phones, Netflix and Spotify do not control the alert function on Smart TVs and Smart Speakers. The alarm API of smart devices is predominately controlled by Amazon Alexa (34%), Google Assistant (34%), Apple Siri (10%), and others (21%). The message waiting notification API isn't a real substitute for an emergency alert API.
Thank the lord I have none of those things and never intend to have any of those things. Also, I only ever use "stupid" devices. Nary a "Smart" device is permitted anywhere near me or any network I use. --- The fact that there's a Highway to Hell but only a Stairway to Heaven says a lot about anticipated traffic volume.