Hi! Yes, flash games were a real discovery at the time. They became incredibly popular because they were simple, free and did not require powerful computers. But unfortunately, flash system had to be disabled in 2021 due to serious security vulnerabilities that could not be fixed. For example, hackers often used these holes for attacks. Instead, safer technologies like HTML5 came along and became the basis for modern browser games. Many older games have migrated to this platform, so you can still find them in the new format. For more information, you can read this article
https://www.unfinishedman.com/what-happened-to-flash-games/.