That is not the point. It is about the level of the competing players. In the Snooker WC there are players from maybe six or seven nations, sometimes even less with a heavy focus on the UK and China.
But these are the best players in the world and the winner of this event can rightly call himself World Champion.
If you call something a World Championship and you can`t get a high amount of top players competing, then it doesn`t really matter if there are 1, 10 or 100 countries featured. You might have a cool, fun tournament with lots of players, but you don`t have a World Championship.
Oh come on. No one thinks these are comparable to the pro snooker World Championship. These are amateur leagues. Pros are not allowed to play in them.
The little league world series is going on right now. Would you complain that they shouldn't call it "world series" because pro teams aren't in it?