I've been considering a Bambu until today. From what I learned today, there is no Lan only option. It now must connect to their servers to let you print. They also said they will disable your ability to print if you don't upgrade the firmware.
You should definitely block it from having internet access. I don't see any way how they'd prevent us from printing when not on the latest firmware if it can't phone home.
You would think that everybody owning a 3D printer would at least be somewhat of a tinkerer and therefore oppose this. Looking around however I've already seen a frustrating amount of people ridiculing the people calling this out. You're probably right though and the people who don't care will probably mostly have gathered around Bambu.
The whole point of bambu was that it was a 3d printer for people who didn't want to tinker.
The people on this sub assume everyone who buys products do a ton of research on the companies making those products instead of just watching a couple reviews.
Most people are not as informed as those that appear in a dedicated 3d printing sub.