Indeed, BSD projects have always provided corporations with free labor.
The BSD operating systems themselves have been largely spared from hostile forks because they are too large and no corporation wants to maintain a fork, macOS being the obvious counterexample. But even macOS cannot eclipse FreeBSD.
Smaller projects should be wary. The should start with AGPL and resist efforts coming from corporations or other open source projects to strongarm them into downgrading the license to BSD or MIT.
Especially when such other projects have convoluted licenses themselves that are only declared open source by fiat due to their historical importance at some point.
Why do you think UNIX companies agreed on MIT license for the basic X Windows infrastructure, but then Motif was commercial on top?
Or how UNIX clones and Windows have used parts of BSD.
40 years now, more than known.