Yes. It should be possible, if they are being transmitted by a RF repeater.
But you won't hear private calls which are transmitted to someone's own hotspot, as the privacy of private calls is handled by the network, and it won't send other people's private calls to your hotspot, unless you deliberately impersonate someone else
And AFIK if you do impersonate someone else by using someone else's ID you will get banned from Brandmeister (I think indefinitely).
(I know someone who got accidental banned and now has to use the local radio club ID as his ID and callsign are banned)