A flash board is interesting. How many browsers still support shockwave by default? Somewhere I still have an archive of SWF's from the early 00's. Most in my collection are probably too offensive by todays standards.
Most browsers now doesn't use Flash, you can just use the Ruffle extension since it is far more secure and will work with the majority of flash content out there. Reading the rules, as long as it doesn't break their social and legal-related rules, I'm sure you can post and find out.