So, is this a bit like "clubs that have accepted my fake id, thus proving it is genuine"? I'm assuming customs are accidentally accepting passports that were printed by internet randos.
[*] Customs deal with the flow of things, whereas immigration services deal with the flow of people.
I think ‘immigration’ is primarily used by English speaking New World countries which historically had large scale immigration (as in, settlement) programs after the world wars—although I don’t have a definitive source for this.
https://nationalcareers.service.gov.uk/job-profiles/immigrat...
https://en.wikipedia.org/wiki/Immigration_officer#United_Kin...