20THOU SHALT NOT APPEAR IN MOVIES FROM THE DISTINGUISHED COMPETITION
This first rule should be taken with a pinch of salt, as the source is a one word response at a comic book convention and there has been no official confirmation of it. But, it's a juicy tidbit if it is true. At the 2017 Supernova Comic-Con in his native
Australia, Chris Hemsworth was quoted as saying it is “illegal” for an MCU actor to appear in a DC film. Marvel head honcho Kevin Feige had previously said that there were no restrictions on MCU actors playing other superheroes (when asked about Josh Brolin playing Thanos and Cable), but in that situation, the rival character was another Marvel one in a Fox film. Adewale Akinnuoye-Agbaje also played Killer Croc in Suicide Squad after appearing in Thor: The Dark World, which would seem to contradict Hemsworth.