I think it is because Flash was used for web-interfaces to serve the content. Many blogs or forums used flash to do more interesting user-interfaces that HTML could not do.
For mobile devices - the same web page layout & features do NOT work as well with a touch/swipe on a phone or tablet sized interface. So developers have been busy building native iOS or Android apps that do not rely on web-technologies.
So the market need for Flash has dropped. Mobile apps, tablets, smart TV's and media servers like Roku, Western Digital, etc., are the new hot properties. And of course native apps get higher ratings in iTunes and Google Play than re-packaged web pages. (Look at the Bank of America app - simply links to their web page in a I-Frame on your phone or tablet. Universally poor ratings.)
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