Have you got a source for the GPL non compliance ?
If I remember what I saw during the day, and from recaps since then, it was only the Bambu Studio slicer (that is a fork of Prusa Slicer), which was provided with review units but without the source code being released yet. The code was released in time for production units. The only violation of the license is if they did not provide the code to reviewers when asked (which may have happened, but is not as clear cut as what their competitors imply)
If I remember what I saw during the day, and from recaps since then, it was only the Bambu Studio slicer (that is a fork of Prusa Slicer), which was provided with review units but without the source code being released yet. The code was released in time for production units. The only violation of the license is if they did not provide the code to reviewers when asked (which may have happened, but is not as clear cut as what their competitors imply)