Comment by r9zgWUN7WS3k6i

It seems that you're thinking about the SWF content in terms of playback, which is not what they were doing. They were looking inside the bundles for ZIP files and malware (4chan users to shove horrible things into the files they upload), and extracting metadata from the SWF. We'll never know the exact details unless they share the source code. It is possible to write a secure SWF parser, but I think they decided to stop supporting this relic instead.

> Ruffle

Yes, they used that. Take a look at the board.