If you wish to constrain participation in a sub, simply create a private one and only invite those you want to participate. What I really disagree with is havi

If you wish to constrain participation in a sub, simply create a private one and only invite those you want to participate. What I really disagree with is having a public sub that's basically 'read only' except for your chosen group. I will straight up filter your sub from r/all if you do that.