You guys really fundamentally misunderstand the issue. The actual reason behind the rando infestation is really the same issue that plagues the community in a number of other aspects as well.

As yourself: what is the biggest vector for randos? How are they getting in?
They're not just randomly joining in from wherever, are they? They're joining off of their friends from vrg-adjacent groups. These people are members of the community who really no longer care to gatekeep. 
I think that most people are at least somewhat aware of this. This seems to be where most of you stop thinking though, and you don't stop to ask yourself why people feel this way. You get mad, yell at the people in question, call them discord trannies etc, but really never make an effort to understand why people feel this way. It's an interaction I've observed many times.
So why do people feel this way?
It's because of the excessive negativity and hostility that you see in this community. Usually you'll see one of the aggressive rando police get in the face of someone who is less passionate about it for hanging out with his friends, and the person basically just goes "you know what, fuck you and fuck vrg, I'm going to do my own thing" and they stop making any efforts at gatekeeping.

People here are autistic and abrasive, even for 4chan. If you want to fix the rando problem and a number of other problems, you've got to reduce the level of hostility that's intertwined in the conversation. Right now neither side is listening to what the other side is saying.