It's proprietary and paid, so even if it works great, it is still closed source.
It's also not a great sign that their website has no option to refuse cookies, only accept (not even a customise menu).
Whenever I would search any image on searx, there were always unrelated anime wallpapers from wallhaven.
This is a regular occurence, even with safesearch.
How did you get ligatures working with neovim?