I didn’t know reddit gave out the personal details of their users, but I guess I shouldn’t be surprised.

You make it sound like they have a choice, or do so freely and willingly.

The article is clear on that they don’t freely share without assessment though:

Reddit wasn’t willing to go along with the request, at least not in full. The company objected, arguing that handing over the requested information would violate its users’ right to anonymous speech.

Recent legal activity shows that Reddit doesn’t intend to automatically comply with all user information requests.