I was 14 once too, that’s how I got into what I do now.
It introduces the threat of being personally unmasked to anyone and everyone is introduced in the event the verification system (or a component thereof containing your personal info) is hacked and data dumped to the public.
It introduces the threat of your data being sold around with the "ground truth" of your identity and photo associated with it.
And even if these threats aren't realized....it happens often enough with related companies that the uncertainty will forever be there.
The threat of public humiliation.
The threat of losing your job.
The threat of losing your social connections.
The threat of personal assault.
All of these come to mind as concrete threats that have played out when someone has been doxed by a malicious person.
And now the risk and consequence of doxing is made so much worse when your government ID is associated with chats that are ostensibly private.