Uh... you can't just "expose a LAN network to the Internet" in this manner. Local subnets aren't routable over the Internet, so you can't just enter 192.168.2.3 and end up on somebody else's private LAN.
https://www.geeksforgeeks.org/computer-networks/non-routable-address-space/
They would have needed to either have all their internal devices being assigned public IP's or had NAT+firewall rules explicitly routing ports from their outside address(es) to the inside ones. The former is unlikely as normally ISPs don't allocate that many to a given client, or at least not by DHCP. the latter would require a specific configuration mapping the outside addresses/ports to inside devices, likely on a per device+port basis.
Either your story is missing key details or you've misunderstood/made-up something.
No, we mean "sharing what they claim is their experience and details of such"
Maybe they weren't sharing addresses and SSN's (though what's stopping them from doing so), but like anything online it's certainly not hard to make up, spin, or highly exaggerate a story to the detriment of the subject, but without them knowing about it.
So yeah, even if Sally Smith claims that "**Billy Jones of 125 South Street is a big loser who has undisclosed herpes, which who knows how he got it with that small dick of his", maybe the truth is that Billy refused to pay for an expensive meal on a first date it some other thing entirely.
This isn't turnabout (as the leak wasn't intentional), and not abuse either, but it may be a bit karmic.
** Names and story entirely made up for example purposes