1. Allowing multiple identities & pseudonyms - maybe I don't want my identity as @furry_mpreg_artist in one discord to be directly linked to @database_expert on StackOverflow or to @local_bicycle_repairperson on my local facebook group?
2. People obtaining these digital passports, and immediately giving/selling/losing them to some bot who can juggle those bits as easily as a human can.
3. What happens if you lose access to your passport? A toddler spills cranberry juice into your desktop, an adversary hacks your computer, you have a psychotic break and overwrite your hard drive platters with magnets & hammers?