he gets the attention of the entire justice league
like, the grimace meme? he cuts to incredibly concerning places that should not be possible for a mortal to access. cuts to a literal green void as Danny stares up at Walker
That one is followed by a followup of Danny in ghost jail
That one is followed up by Danny not in ghost jail, but he refuses to elaborate on how he got out
When the Lil Nas X Montero meme was out? danny literally played it as he descended to Hell from the Infinite Realms. Constantine recognized some of the demons.
When he participated in the devious lick meme, he straight up stole Wulf and declared himself the winner, because who else could say they stole someone from a high security prison?
Can't think of anything else at the moment but u get the point.
the league doesn't know that Danny is Phantom, they just see a young teen with potential powers of either chaos or luck dimension hopping for an app.