4.9% of Websites Use Flash, Down From 28.5% in 2011 (bleepingcomputer.com)
Web makers continue to ditch the infamous Flash for other safer, improved technologies. In 2011, more than 28.5 percent of websites used Flash in their code, a figure technology survey site W3Techs estimates to have dropped to 4.9 percent today. BleepingComputer: The number confirms Flash's decline, and a reason why Adobe has decided to retire the technology at the end of 2020. A decline from 28.5 percent to 4.9 percent doesn't look that bad, but we're talking about all Internet sites, not just a small portion of Top 10,000 or Top 1 Million sites. Taking into account the sheer number of abandoned sites on today's Internet, the decline is quite considerable, and W3Techs' findings confirm similar statistics put out by a Google security engineer in February.
Newgrounds, Kongregate, Albino Blacksheep, Dagobah, Animutation Portal, and the like still use Flash to present vector animations and games whose authors either can't be located or lack the time=money to remake them from scratch using HTML5.
A WebM or MPEG-4 video is not a close substitute for a vector animation because a video's file size is roughly an order of magnitude larger, eating into the viewer's cap. (Though most devices with a built-in cellular radio can't play Flash in the first place, home wireless ISPs impose a monthly Internet data transfer quota even on desktop devices.) It's an even worse substitute for a game, unless it's a narrative-driven game that can be fully experienced in a playthrough video.