No.
A bit like giving them passwords connect to a Tahoe-LAFS instance I would host but without the data being redundantly copied thrice (since I only have one machine).
The server is completely unaware of the contents, and only people who are explicitly given the capability/link will reasonably find it.
And if I enabled data expiration, then one would have a rather limited window before the data is just entirely gone whatever it may have been.
