I am still able to use OrcaSlicer on my Bambu A1 (which was bought before all these shenanigans) and mine is in v4.0.0.0 firmware with LAN only mode enabled. I believe newer machines require a special developer mode hidden deep in the settings to allow third-party software (stupid, I know).

It means you won't be able to use Bambu Handy (not too bad for my use case though)

There are plenty of videos discussing the topic though. If you don't have a Bambu printer yet, please don't go out and buy one. If you're stuck with one, put it to LAN only mode (or developer mode which is a special hidden LAN only mode on newer versions) to use OrcaSlicer