For the most part flash is being been phased out because it so vulnerable to attack and most flash installers are phony malware. HTML 5 or has also rendered flash kinda useless since it has it own dynamic video toolset built in. Most browsers block flash sites by default. The only time I see a site that used flash based video is because it hasn been updated in 5 years. I tend to leave it off my machines and stay away from sites that ask you to install because half of them are trying to trick you into installing something malicious.