Playing League often does feel like matchmaking is doing strange things that are statistically impossible. I agree that even doing nothing at all / afking would result in a close to 14/24 win rate. There's many people with better win rates than that who only feed every game silver.
Of course this is labeled conspiracy but there are a few things that hint that it might be real:
Tilting: I've played games my whole life and tilting isn't not close to as tangible in any other game as it is in LoL. Most games the phenomenon is unheard of. Perhaps tilting isn't as real as people think and the system pursues patterns that create what a cynic would call a tilt.
**Smurf Detection: **The game supposedly has smurf detection where it finds and accomodates for smurfs forcing them to play against other smurfs. Maybe something like this is at play and a series of good games could result in a manipulation of the match ups.
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Toxic Island: **There also used to be theories of toxic island which I think was verified to exist where if you had bad performance or behavior it put you with other toxic players. It might never have existed or been removed at this point but if it was real it's proof that there is manipulation.
The final most important theory is greater then LoL:
We are Living in a Simulation: Rationally we can deduce we are actually living in a computer simulation (most likely a simulation within a simulation etc. by answering these two questions:
Will life anywhere anytime ever have the technology to create a synthetic consciousness through computing?
Will life anywhere anytime ever want to create a synthetic consciousness through computing?
If you answered yes to both those then rationally it's basically guaranteed we live in a simuluation.
LoL in this case is a small cog in a simulation of some unknown purpose and it's likely the simuluation can pull strings to accomplish it's intended effect hence things like Murphys Law and other patterns we might notice in our life that seem unlikely to occur. The simulation could easily make statistics or chance only an illusion that we are coded to believe where as everything is deliberately planned. The world we are being simulated in most likely has no context to ours so things like physics, and numbers and statistics most likely don't exist there and we couldn't comprehend the intention or the realm the simulation exists in.