I don't even remember Fortnite being announced. The first thing I heard about it was that it was ripping off PUBG, which I'd barely heard of, and the next thing I knew it was bigger than Jesus.
I do remember seeing the announce trailer, but I couldn't tell you when I saw it. Probably some E3 a couple of years ago? I can recall that I thought it looked gimmicky and crap, though.
When it was announced it was basically a game which revolved around a four player co-operative Horde mode though, wasn't it?. The first trailer was a cinematic based on that concept, and even now I think that mode is down as being a full-priced release, still in early access, which has been completely overshadowed by them having since bunged in a FTP PUBG rip-off as an "alternative" game mode.
I'd echo most of the sentiments above though, even though I do watch the odd streamer (mainly to see what some new indie title looks like, or maybe watch someone play a comedy Hearthstone meme deck for easy background noise). I've also seemingly lost all interest in the vast majority of new AAA releases, and have turned into some kind of weird gaming hipster who increasingly only seems to care about Soulsbornes, indies, Roguelike/lites and strategy/RPG games (despite being largely terrible at many of those genres). The odd action/adventure game still slips through too, but frequently it's a fair while after release, having been picked up in a sale. (This applied to Horizon, Shadow of the Tomb Raider, etc.)
Even series I used to like I've largely stopped being able to generate interest in, like with Assassin's Creed, Far Cry, and even God of War. (I was, and remain, more excited about the second Divinity: Original Sin game getting a PS4 port than about the new GoW, despite having still not gotten around to the first.) Any and all interest I had in fighting games and FPS's seems to be all but gone too, despite the occasional attempt to rekindle it.
I've also abandoned most online "lifestyle" games, to the point where I gave up on Destiny 2 slightly ahead of the curve, dropped ESO not too long after trying to get into it with Marit, and deleted Overwatch and Rocket League for the sake of my productivity/sanity levels. I was interested in sea of Thieves, so am actually glad it's a Bone exclusive so I can't be tempted. Even Monster Hunter World hasn't grabbed me at all yet (though admittedly I am only two-three hours in), to the point where I couldn't be bothered with it last week, so I spent half of the week playing Rogue Aces, and then just (finally) started Fallout 4.*
- this is another side-effect of finally ditching Destiny, Rocket league, et al - I am actually playing the backlog! I'm seemingly about 3-4 years behind, so I spent the last few months playing Dragon Age Inquisition (and all the DLC), and now seem to just be working through all the big RPG/adventure games I have while I play a few other things on the side, so at this rate I'll probably finally get around to The Witcher 3 sometime next year…