On the other hand, the SFC contends that because bambu_networking is required to run the Bambu Studio, it falls under AGPLv3, which the Bambu Lab’s slicer is licensed under. Bambu Studio itself is a fork of PrusaSlicer, which was also based on Slic3r. The original Slic3r uses AGPLv3, meaning every derivative under it, including Bambu Studio, must use the same license. The fact that bambu_networking is flagged as proprietary breaks the copyleft license and violates several clauses in the license agreement.

So they are crying foul while the code is based on an APL fork of the original which is also AGPL. By making their networking proprietary they are basically making it break the license clause which they should legally honor.