Starting Chrome 69, every time the user restarts the browser sites using Flash will require an explicit click to run Flash. That is, previous settings for Flash will not be remembered.
https : / / w ww.chromium.org/flash-roadmap#TOC-Upcoming-Changes
Further and future Chrome updates will require more manual steps and/or make it harder to run Flash content. Adobe (creator of Flash) in conjunction with all major browsers, has announced to end-of-life Flash by the end of 2020.
https : / / blogs.adobe.com/conversations/2017/07/adobe-flash-update.html
https : / / w ww.chromium.org/flash-roadmap
You can help by asking such websites/webmasters to change to using modern HTML5, which will be supported by Chrome browser, Chromebooks, and mobile devices.
This will become a bigger and bigger problem for websites that haven't converted their Flash content to other distribution methods.