https://www.geek.com/games/us-goverment-confirms-league-of-legends-is-a-legitimate-sport-1562188/
Got some news for you mate, and if you don't think that's a legitimate source than just google it. It isn't a question of whether or not we should consider it one, it has already been answered. League is a sport now. Whether or not the general populace agrees is a different matter but I would assume that they are actually very welcoming to the idea based off of the reactions and how massive a following League has now. Worlds has gotten bigger and bigger, the attention the game has gotten has gone up as well. So... yeah, League of Legends is an official sport and its pro-players are recognized as official professional athletes.
The times are changing and I for one am actually quite happy with this result. You can compare it to many of the other sports such as chess that doesn't require much physical activity but does need a hardcore dedication to master. I get not everyone is ready to accept it as a sport, but I think it is amazing to see how far the game has come. The thing I am most excited about and yet worried about however, is how do you keep League as an official sport with the ever increasingly more rapid rate of technologies growth. Where will technology go and where will it take League? That can go two ways. The game either becomes outdated and archaic as well as incompatible with future tech or it takes the game to an entirely new level. I am curious and excited to see what Riot does and how they handle the ever changing and rapidly advancing tech, yet can't help but be worried that maybe even tech will leave the game behind.
Edit: Got to add, I don't care about other official sports like football, baseball, or basketball however I get people's passion for them, and I would say that passion is very similar to the one many of us have for League. At one point or another every new game, whether heavily physical reliant or more mentally reliant, they were all just a game at the beginning. Then they got more attention, people cared more and more, we are witnessing right now the birth of an entire new sports era, thus the E in E-Sports to signify its connection to tech with electronics, tech has become a vital part of our lives and exists almost everywhere. With how vital and important electronics have become, this to me was just an inevitable natural outcome for even sports to be born from techs ceaseless march forward.
Edit 2: Last one promise.
I have to say that this new era of sports, in particular to this case League, is great for the current youthful generation. The internet has allowed us to communicate on a regular bases to the entire world. A few decades ago that was unimaginable that you could be in NA and have a casual conversation without a phone to millions of people in china. Humans are more connected to each other than they have ever been. Sports have generally been for the most part restricted to their countries origins. Sure, you have FIFA and many other similar sports that do have multiple countries competing in a Worlds like match, but you don't usually see a big following other than soccer and the olympics. League is a perfect new form of sport however to match this era of global communication. A perfect sport to represent this internet connected world. Maybe not perfect, but it is a huge step.
Well that is all just my opinion anyway :D