This is a complex topic and while I’ve shared a personal experience in a prior post, I do not have the depth of knowledge necessary to solve it.
That said, I’ll throw this out as a brain tease on which to build. It’s stated someplace (I think) that OGS gets 1500 new players a month…if true, that’s 30 per day on average. Perhaps they can all be matched against one another exclusively so that they can play other new players, or newer players with, say, 3 or fewer games (not necessarily only enrollees from that day). This is like provisional system now, but keeps it inclusive for just a very few games. Until they’ve played other new enrollees, they cannot play others here, ask for challenges, be in tournaments, etc,. In short order (three games or so), the 1 dan would be distinct from the true 13 kyu from the new 25 kyu beginner versus the “just dipping a toe, goodbye now” quitter. After three games against other new players, _then_they could open up to a “provisional rating” that can play more openly on OGS but the rating is a better estimate of their true rating than simply labeling 13 kyu and leaving them to the sharks in open water. lol Win all 3 games, first provisional Glicko rating is 5k; 2 of 3 wins, it’s 10k; 1 0f 3 wins, its 15k; 0 of 3 wins, it’s 20k…for example. Some will ask, “What if three dan level new players happened to draw me and beat me but I’m really not 20 kyu?”, and the answer is that could happen, system not foolproof, but on average, three games would give a better estimate than random 13k assignment. Finally, some might argue that overall, playing three games will simply come to the average of all new players playing, which will be around 13k, but I think this system would provide (a) games for those that simply cannot get games now because no one will play new players, (b) sort out the quitters, who will timeout or quit altogether after a game or two, and C) still, the dan players will tend to win all three games (since there are fewer new dan players signing up for OGS compared to newbs) and the brand spanking new player will tend to lose all three games, so I think it does serve the overall purpose of getting them a new “rating” that is closer to reality than giving everyone the average 13 kyu.
I could be wrong that this would work–I am throwing it out for your building upon or discarding.