> existing copies of the software must are covered under the license agreements.
While this is true, it should be noted that we can't know which license will be applied at this point.
Remember that (L)GPL forces you to release your source code under some specific circumstances, and the implied condition here is that you have accepted the license in the first place. If you didn't ever agree to that license, you are clearly violating GPL but otherwise any other restriction of GPL doesn't immediately apply to you; it will have to be resolved in the court. And it is entirely possible that you and original software author(s) can reach an entirely different agreement that doesn't involve GPL at all. So as a user, you can't technically request for source codes right now. (Of course, it still is a not-too-bad strategy for users as original software authors can always demand GPL.)
While this is true, it should be noted that we can't know which license will be applied at this point.
Remember that (L)GPL forces you to release your source code under some specific circumstances, and the implied condition here is that you have accepted the license in the first place. If you didn't ever agree to that license, you are clearly violating GPL but otherwise any other restriction of GPL doesn't immediately apply to you; it will have to be resolved in the court. And it is entirely possible that you and original software author(s) can reach an entirely different agreement that doesn't involve GPL at all. So as a user, you can't technically request for source codes right now. (Of course, it still is a not-too-bad strategy for users as original software authors can always demand GPL.)