someone would have to check it all before the badge is awarded - it doesn’t seem very applicable.
It can be automated. As long as "address" has BTC, they will have the badge, once they don't have BTC, badge will be removed. So, it will be changing everyday depending on the holding lol.
But still, this is something which people have to attach their address with the forum and make it public as you said people will have to sacrifice their privacy, I too agree this is something not a good idea. I'm not sure if Jet Cash did a joke here lol but his tone seems to be serious.