Isn't Jeep the company that introduced infotainment pop-up ads that play at the stop light? I doubt they'd want you loading an open source OS replacement to avoid that.
I don't think the software hacking side of Wrangler mods is barren. e.g. https://www.jlwranglerforums.com/forum/threads/jeep-hacking-..., which IIUC has been commercialized into https://www.zautomotive.com/products/z_tzr_jlm.
I don't know that anyone has broken the head unit firmware though.
If any car could be the champion of OpenSource, it is a Jeep Wrangler, but they're using an OS made by SiriusXM for some reason.