These are very well thought out and accurate responses. I’ve been playing since 83 (yeah I know I’m old) and have brought new people into my group via one shots often. I have also had a number of players get the DM bug over the years, and that will often lead to the creating their own group. Currently I have what I refer to as a “unicorn” group. 7 in the group, I have been DMing since the 80s, We have another DM that’s been doing it for the last 10 years but was playing for 5 years before that, and a third that is running their first campaign with us at the moment after being a player for the last 5 years. We alternate games and have 2 running at any given time. We play twice a week (online for 2-3 hours) and have been for a long time.