Why is everyone mad at them? I'm not blaming either side, but it sounds like a rather typical failed negotiation.
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...>
It set a HTTP user agent string...
> But he wanted to be “properly acknowledged” for possibly revealing “a significant security gap
> Jarczak’s code shows that his fork of OrcaSlicer identifies itself as “BambuStudio,” but mostly just by saying that out loud and hoping Bambu’s systems don’t ask any questions. Image: Bambu
is the “security gap” claimed by Bambu