It became very focused towards the 18 year old mindset and if you didn't always adhere to the same ideology, you'd get trolled and/or downvoted.
The fact that a huge portion of the big subs were controlled by a small contingent of mods.
The API was the nail in the coffin. I stopped contributing the week of the 12th and only logged in to look at the general state. It was a little painful (and still is to some effect), but cutting something off after 14 years wouldn't go unnoticed to most people.
I'm acclimating fast and enjoy the feel of this place. Thanks to those of you making it what it is.
You're helping! I was nowhere near as much of a contributor on Reddit as I have been on Lemmy these past few days. Users like you and me will help build this place into something hopefully even more special than Reddit was.