Tracking Flash's decline with Stack Overflow question trends, and looking at tech with similar trends: https://stackoverflow.blog/2017/08/01/flash-dead-technologies-might-next/
miniblog.
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Even the makers of Flash argue against splash pages on websites!
Archiving Flash content before the plugin dies and the websites disappear forever:
https://blog.usejournal.com/adobe-flashs-gaming-legacy-thousands-upon-thousands-of-titles-and-my-efforts-to-save-it-58c14811558a
(Though there's still a need to preserve content using platforms that aren't about to die, the demise of Flash has spurred this project.)
Good end-to-end crypto is important, but every time I update my system there are RCE fixes (browser, flash, etc). The ends aren't secure!