Hmm. Never considered Linux! Open source competition. Seems impossible but more power to ya.
FWIW, whilst Linux itself is OpenSource, not everything on it needs to be and I have a number of paid-for programs on it, a number of paid-for programs under Wine. In any case, OpenSource does not preclude charging for software and a number of companies offer support services for their programs.
BIAB
can be made to work under Wine, but it can be quite a bit of work and needs the audio like RealTrack files in .wav format.
I use Linux for around 95% of everything I do. The exceptions are probably just BIAB and my PCB CAD.