I mean it can also be used as a universal, semi-permenant activity tracking id with almost no work, which may not be desirable depending on your feelings wrt pr

I mean it can also be used as a universal, semi-permenant activity tracking id with almost no work, which may not be desirable depending on your feelings wrt privacy. Maybe an ability to generate virtual IDs based on a permanent id (like with virtual credit cards) might help though this is sometimes tricky to use correctly in a privacy-preserving way.