For all this talk about moderation policies, the CHUDs kinda lost sight of the fact that Parler isn't going to break the law for them. They will respond to subpoenas regarding the criminal behavior of their users.
Since it has such loose moderation policies, many on the service felt pretty comfortable making death threats or openly discussing their intentions to engage in criminal violence. Parler will allow you to conspire with other criminals. Parler will allow you to post videos and pictures that are rich with metadata. Parler will kindly pack this up and turn it over the feds when asked.
I can't find the link now, but there was one press release that heavily implied that someone was ID'd not from video, but from information the feds got from Parler after issuing a subpoena.