From Homestar Runner to Salad fingers to badgers, stick figure battles, and the End of Ze World, this — dare I call it an artform? — was a cultural touchstone for a generation.
Flash made vector animation available to the masses, and internet distribution of the relatively small video files was a piece of cake. With the filetype now essentially deprecated, the creators gone on to bigger and better things, the distribution sites shut down, it is a dead form. Most of it will be lost forever, although there may be someone archiving some of it for posterity.
There are huge archives of flash animations and you can install a safe “emulator” for playing flash that even runs in your browser. Look up Ruffle. I can’t remember the name of the big archive site I used, but it didn’t take much googling. I know I was able to find Homestar, Larry Carlson, Adam Phillips (bitey), joe cartoon and salad fingers as well as a ton of games from back in the day.