@amadeus I do not know, I only heard some some birds that the latest Push 3 is powered by Linux and has Ableton code inside.
So it is technically "Ableton Live on Linux".

Most likely it comes down to support. Many companies use libraries/frameworks that already support Linux. But these companies have no experience with Linux and don't think the expense is justified.

I have seen Linux builds that do run, but due to support costs companies prefer to keep it at macOS + Windows only.