To what extent the Apple product is spilling data to Apple, it’s the Apple software doing it, which Linux would mitigate, but depending on which mac you have, it may not even support Linux yet. If anything, you should probably be more paranoid about Windows on modern Intel. The secure enclave shit Windows 11 requires has its own network stack it can use to phone home sans the OS knowing.

You’re basically just running Firefox ESR with some config changes at that point and completely defeating the point of running Mulvad browser specifically by producing an absolutely unique fingerprint.