if you adjust the brightness, you’ll see something. The person in charge of the ARG implementation will be adding more as time goes along. Make sure to follow the account for updates
I'm not sure, but insta may be messing with it? Like you can't "save" the photos, so I went into the developer tools from chrome and downloaded it raw. Then I put in in GIMP and brightened it up
Unless we're meant to brighten it on insta itself, it may be broken?