I have an Ender 3 too. And I have a Bambu machine - that I leave offline and use via microSD card as the Ender got me used to.
I get it. The convenience of networking - when it works FOR the customer - is great.
But networking controlled by corporations is a path to enshittification.
At least your use case would be served well by enabling LAN mode, which doesn't let the printer talk to the internet, even if you want it to (and I want mine to).