My dad did that. The man has a slight obsession with collecting information about our entire extended family, as far back as he can go in time. He's been known to get in touch with small municipalities to ask for their records about someone 8 generations back. He's collated quite a bit of data over the years.

And then one day he went and loaded all of that into a shitty mobile family tree app. Phone numbers, current addresses, email addresses, photos, a shit ton of personal information of a shit ton of people, uploaded to some random developer's unknown database without their consent. He didn't even pause to think about it for one second. I told him what he did, he wasn't even bothered.

There are tons of people like my dad who don't have a single cell in their entire bodies that gives a flying fuck about data privacy, unfortunately, and they give out everyone's data along with their own.