My Joy-Con finally experienced drift earlier this month, literally the day after I beat Dark Souls Remastered. I beat the final boss and played around in new game plus for a while then stopped. The next day I go back to play the game and when I move my left stick to the right my character wont move. They'll move to the left or down, but not right or up. Then when I wasn't touching it at all, the character started walking to the left all by themselves. I tried to re calibrate the stick but the issue was the same.
I then played Zelda II, on the NES app since the D-Pad button still worked but every once and a while Link would randomly start moving to the left even though I'm not touching the stick at all. This made me research what caused drift and I'm lead to believe it's something getting worn down and leaving debris. That would explain why I'm getting drift from a game where I'm not even using the joystick. So I went and bought some compressed air and spray it inside the joystick. Now this has stopped the drift when I play 2D game now, so I can at least still play NES/SNES game and many of the indie games I've bought. But when I tried playing something with the joystick like Dark Souls or Smash Bros, if I try to move my character to the right, they'll move now, but it's all jittery and running is impossible in that direction. So there's still something messing up right movements in my Joystick.
So yeah, I basically can't play anything that requires the joystick right now. I mean it's not that big a deal at the moment since the majority of the games I've bought are 2D, and the Mega Man Zero Collection next month will keep me busy for a long time. But it is annoying that my stick did this so quickly when I hardly ever used it. At best I might have put about 300+ hours into using the stick, which is nothing compared to the amount of time I used the joystick on previous Nintendo controllers that still work.