WandaVision: What Is WestView? Theories
WandaVision: 3 Theories on What Exactly Is Going Down in the Town of WestView
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This theory jumps off the previous one, but it stands to reason that there must be something going on with the other residents of WestView as well since they're just as trapped as Wanda. We know they're real since we've discovered that WestView really exists as well. An obscene amount of Easter eggs suggests that several residents could be Marvel heroes and villains, and, if they are, we have to wonder how they also wound up in WestView.
It's heavily implied that Kathryn Hahn's Agnes is the MCU's Agatha Harkness, and, if she is, then there's comic precedent for the idea of a community of witches kept undercover. After the Salem Witch Trials, Agatha and her witch community shielded themselves from mortals and called their home New Salem. WestView could be that, while Wanda was searching for a place to call home or some solace, she stumbled across this haven for witches before things went topsy turvy! Whoever it is that's controlling Wanda could have trapped all the witches in what used to be their home and is sitting back as their plan unfolds. It explains why Agnes would ask Vision if he and Wanda are there to save them in footage from the trailers.