It feels like trademark law has been twisted toward requiring misrepresentation rather than preventing it.
There are technical differences, as well. Most of the time one will never tell the difference (hence "Unix-LIKE": you'll likely never know). But BSD is not Linux, and vice-versa. For a really poor analogy, kind of like the electric version of an ICE automobile. Looks a lot like the ICE version (well, the grill is kind of funny), operates mostly the same, but under the hood it's different.
I don't have a problem with people calling Linux "Unix-like", I have a problem with people feeling like they have to call actual Unix descendants (like forks of BSD and SVR4) "Unix-like" while IBM gets to use "Unix" for z/OS.
There are technical differences, as well. Most of the time one will never tell the difference (hence "Unix-LIKE": you'll likely never know). But BSD is not Linux, and vice-versa. For a really poor analogy, kind of like the electric version of an ICE automobile. Looks a lot like the ICE version (well, the grill is kind of funny), operates mostly the same, but under the hood it's different.