Consider a world where everyone knows about the masquerade, knows someone who was a victim of probable vampire attack, can look up footage of actual vampires showing off on the internet, etc.

The masquerade is still real because no media outlet and nobody with any degree of power will acknowledge it as anything other than a hoax or a rumor. The vampires have complete control of anyone with a media outlet or political office, and can keep pushing a transparently false version of reality as if to say "well, what the fuck are you going to do about it?"

You can talk about vampires in the shadowban ghetto, and sometimes your videos will even stay up for a few hours, but if you actually threaten real players in the masquerade, you get federal charges shoved up your ass like Doug Mackey.

At least half of the people you meet will quietly acknowledge that humans aren't the top of the food chain, and the other half will shriek in outrage (but also download that app that notifies you if you're in an area that "experiences a high rate of unexplained disappearances"), until it gets removed from the app store for inconveniencing the 'people' in charge.

Frankly it's more horrifying than a world where the monsters feel like they have to hide.