how does my game appear in game-list

when start a new game, usually this is seen immediately in the list of games in the Lobby.
When many people play, it seems there is some kind of "rotation".
Not all games are shown at the same time, just a few.

This is what I feel sometimes when I have a "trading-game" open:
1 hour nothing happens, then 5 people join within a few minutes, then again long time nothing.

Does anybody know the algorythm behind that?
I.e. is there anything I can do to trigger that my game is shown?
E.g. beeing active, not just standing?
Has the number of players anything to do with it?
Or is it the time the game is open?
or the time when my game was on the games-list last time?

Anybody know which factors play a role here?

Of course they cant fully list every single game there, there are so many. So it refreshes / you can manually refresh every 3 seconds to update the lists.
I dont really have any idea about the algo. behind it though.
Suppose the game lists the joinable games just randomly?

But at least they have the search option. Wish there was a Black/whitelist of some kind so all the trading website advertisement could be blocked.