how can league have 100 mill players and still have the worst matchmaking iv ever seen

There are multiple servers and elos

because they don't have 100 million players lol

one month they had 100 million unique ACCOUNTS log in, this could be 50 million people logging into two accounts(obviously this breakdown is highly unlikely, but you get the idea)

they stopped advertising their 27 million daily players in favor of 100 million unique log ins because they lost a FUCK TON of those daily players to horrible game balance, thoughtless changes, and ultimately ruining the ability of players to solo carry games when you know for a fact 9 out of 10 people do not practice enough, and don't take the game very seriously. you can't make it a team game when you have a team LESS MOTIVATED THAN A JR COLLEGE GROUP PROJECT TEAM.