Companies with any sense redesigned their sites ages ago when the OG iPad sold crazy amounts and couldn't see the sites. And given that Flash is anti accessibility that was another reason to stop.the security concerns adding a third.
Bingo. Jobs's Thoughts on Flash (2010) is quite educational. One note: Jobs's comments about Flash games are obsolete: Flash games can be compiled and distributed via the App Store. Adobe even bragged about a Flash-based game that hit #1 in the App Store back in 2011.