Because they're unjustifiably being huge pricks [0] and violating an OSS license that covers the software that they've built their commercial product on top of. [1]
[0] <https://www.youtube.com/watch?v=jIbpQtoz6hs>
[1] <https://sfconservancy.org/news/2026/may/18/bambu-studio-3d-p...>