I think this is unrealistic considering technical debt involved in any codebase. There is an example of what you described, specifically a company that rebrande

I think this is unrealistic considering technical debt involved in any codebase. There is an example of what you described, specifically a company that rebranded Blender, renamed it to 3DMagix. I guess the companies you're describing are mostly out to make a quick buck and they'll do it regardless of licensing.