Yeah about that... I doubt any of the creators or writers peruse forums like these much when they are working on a project because it's very dangerous (If they admit to doing so) come up with an idea that similar to something a group of fans posted on a forum, and depending on the situation one or more said fans might try to claim they came up with the idea and thus Disney owes them royalties because >X< MCU producer or writer obviously read the post and immediately went to their typewriter and used that idea for the story seen in an MCU project.
So yeah if they two take a gander at social media they do it very cautiously and very sparingly.