That said none of this is surprising. Bambu Labs have been very candid about their playbook which is following Apple's lead. They want to be the Apple of printers, a very walled garden with high integration good UX and not a lot of freedom because they want to tightly control the full experience.
And that is going to alienate a lot of people and endear a lot of others. The only reason they've even paid lip-service to open source or open hardware is simply to get a foothold in an industry that had strong roots in that area. Now that they're a more established brand we should expect them to start bricking in the garden and adding controls.
Fortunately I think they've been a net-good for the printer landscape, they shook things up pretty hard and I think there's now more competitive models from other brands.