Exactly, that’s why they’re still around. They still haven’t been used at their intended scale since before most working adults had left home.
If anyone else wants to feel old, MySpace is old enough to drink and the iPhone can vote. College graduates have never seen someone type on a t9.
The “large vault” you’re referring to is either old enough to predate the internet or full of safe deposit boxes for rent.
Even busy bank branches probably only need a vault the size of an armoire these days. People just don’t use much cash.
According to the threads I found privacy guides:
It mostly just doesn’t work well.
It hasn’t been independently audited
https://discuss.privacyguides.net/t/add-jami/20052
https://discuss.privacyguides.net/t/why-is-jami-not-listed-in-pg/12500
There’s a dungeon by me that has stockades but doesn’t allow free use and it is the mother of all missed opportunities.