That is the norm in other countries as well: an invite from pre-booked lodging. Sometimes it's necessary to engage a company which specializes in issuing invitations--I'm thinking of Russia, at least for US passport holders. And working or business visas might be different, requiring documentation from your in-country employer.
I don't remember ever getting an invite from an actual person, despite having journeyed to countries specifically in order to visit friends there. I've listed friends' names and addresses in response to questions about where I'll be staying, but haven't had to submit letters of invitation. Yet.
All caveats apply, but I hope that's helpful.
Mark
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