People get permission to build Commodore 64 clones, for retro computing preservation, and Hacker News says that's great. Someone requests similar permission for Flash, and now we're upset about the notion of a proprietary codebase being open sourced? Why? Because Steve Jobs said it wasn't cool? Because you're seriously afraid that it would make a comeback, and dethrone HTML5 on the mainstream web?
Guys, someone started a petition to ask a company to donate a propriety codebase after EOL. That's all. This is just idle chat, because nothing in Adobe's history suggests that they would actually consider this.
Regardless, if you would rather NOT see a historically signficant codebase open sourced, then simply don't sign the petition. And take all the low-quality jokes and guffaws back to Reddit, please.