CyanogenMod, which was the base of most custom Android ROMs at one point. After taking venture funding, incompetent business majors crashed and burned the project trying to commercialize it. It was then forked and LineageOS was born.
Because business majors only know how to exploit good things that would be better off without them.
If the good thing is left to just be better off without them – while they fuck around with a separate thing – then people will never be interested in the business majors' product.
The funny thing is the whole commercialization process started with one of the future partners messaging the project lead out of the blue on LinkedIn. I don't know about you, but taking ideas from a random LinkedIn user doesn't strike me as good business sense.
Then again, getting something out of your years of unpaid volunteer work must be incredibly tempting, given how many open source projects have sold out over the years. At least it was to form an actual legitimate company this time, unlike when SuperSU (the Android root solution before Magisk came along) sold themselves to a scummy foreign ad company. That one still ranks as the all time top WTF sale.