An unknown number of unknown people of various ages with an unknown amount of resources have been executing DDoS attacks on League of Legends servers.
For brevity - a DDoS attack is, in its most simplified form; a massive amount of ping requests made to a server. I'm talking inexplicably large numbers of requests made. This is also why the client says "Over 20000" players are waiting in the queue.
These people send requests to log-in at such great volume and rate that servers are backlogged and eventually flooded with fake 'requests' to play LoL.
"Why do they do that?", you might ask...
They are anonymous. They are legion.
These kinds of people are beyond the scope of morals and reason; they are afflicted with a cognitive dissonance somehow related to a disagreement with a number of societal institutions. Among them are big businesses with a profit motive, a group of whom Riot Games is a part of.
Not every participant is truly anonymous. But when enough people convince themselves that they are doing something different, and that something is better...
That's when counterculture becomes a paradigm shift.