As much as I may understand the decision, I'm still very sad.
Winterbash was a big part of many years of my career at Stack Overflow, and I enjoyed the work on it tremendously.
I had a lot of fun building countdowns, knitting machines, realistic stick figure snowfights, realistic snow fall animations, and chickens, and more chickens.
I enjoyed updating FAQs with a twist, drawing red herring hats (I'll explain that some day), tweaking the hat placement mechanics, and when I left the company in 2019, writing down detailed documentation of how everything Winterbash-related works in our internal Stack Overflow for Teams instance.
Most of all, I enjoyed seeing how our users had fun chasing and wearing hats and discovering the easterEaster eggs I left for them.
I made a little tribute so we don't forget: https://winterbash.rip *
Rest in peace, Winterbash. You were awesome.
* personal tribute, to be clear -- not endorsed by Stack Overflow Inc.