There is an active court case to determine this. Bluebird asserts that rebranding the company to X is trademark abandonment. XCorp of course says "nuh uh" http

There is an active court case to determine this. Bluebird asserts that rebranding the company to X is trademark abandonment. XCorp of course says "nuh uh" https://en.wikipedia.org/wiki/X_Corp._v._Operation_Bluebird https://en.wikipedia.org/wiki/X_Corp._v._Operation_Bluebird