I mean
Go ahead and congratulate the Fortnite competitive scene all you want if that's your belief but in doing so you're essentially defending casual videogame demagoguery over the so-called "spirit" of e-sport, which is to excel in mechanically challenging and complex feats that are meant to represent the player's consistent skill level. This is the underlying principle that leads us to feel jealous, because we understand that TF2 is a mechanically complex and precise videogame. Another game that is exemplary of this is Quake, with its obscenely fast-paced gameplay. CSGO and RTS games have some degree of random variability in them, but they nonetheless remain complex and require great degrees of effective and communicative precision.
Fortnite, much like Overwatch, isn't getting such great degrees of competitive attention out of respect for the spirit of excelling at mechanically complex tasks, but exclusively as a publicity stunt to gather attention. Whatever attempt at validating the "artform" of e-sports is undermined by the sole principle of generating revenue. Profit always comes first.
So yeah, go ahead and congratulate Fortnite, but at least acknowledge that in doing so you're betraying every principle that is supposed to make e-sports special. At the end of the day it's just bullshit internet videogames so no one should really care much, but the same phenomenon happens in other, more serious events and it is dangerous to remain ignorant of reality.
It's like saying the Coca Cola logo has as much artistic value, if not more, than the Mona Lisa.