@gryyy Ok. I believe I read that Calls will include talkgroups that are not allowed on traditional Broadcastify feeds, such as ambulance-to-hospital talkgroups and police tactical talkgroups. However, it is my understanding that those restricted talkgroups are for the benefit of the feed providers only, and not the general public. From the way you describe 49B, with patient info being given, that would be one of those restricted talkgroups.
OpenMHZ is a different organization and probably isn't as restrictive about the contents of its feeds. But like you said, they don't store the archives as long.