They pushed a firmware update which blocked direct use of your printer without using their proprietary “Bambu Connect” application - because ‘security’.
Are you sure you aren't just running older firmware (my A1 mini is a recent acquisition)?
Also probably AGPL infringement, since the slicer is a fork of priser slicer which is AGPL, and you can't build the slicer from source, because if you could, then you could use the binary plugin for communicating with the printer in other slicers -- but you can't.
It's pretty blatant IMO.
But it's also a printer that just works.