You can also make passes for other people and send them / share them.
Looks like someone else recommended a competitor Pass4 Wallet as well, may need to go compare.
The weird thing is that this was a feature when Wallet was first introduced. You could create a URL that would add a pass to a wallet. There were web sites that helped out with it. I still have some of the passes I created this way a decade or more ago.
It's actually better than native passes in some cases because you can add custom info to the entry, like a gate code. It's really flexible in terms of barcodes, QR codes, etc as well.
Great app I'll probably continue using, I'm not confident Apple will allow the amount of customizability it allows.
https://girappe.com/ is also dead
As someone who does roughly the same thing, the language used to describe the new capabilities isn't encouraging to me; I don't want to "add a pass", I want to "add a photo" and bypass all of this other complexity entirely.