Adding new variants like DuckChess, yeah, that makes sense. Adding a 960 option to Crazyhouse is a few lines of code. If PyChess.org can do it, so can LiChess.

It is indeed a thing! Check it out on Pychess.org

I enjoy 960, and I enjoy Crazyhouse. Crazy960 is chess at its purest - no lines to memorize, no endgames to push for, just pure tactics.