It is simply a financial decision, Launchbox is a business for Jason, it's not a hobby project even though Jason loves working on LB. It's not even a side project to supplement his income, Launchbox is his income to support his family.
I am hopeful one day a Linux version makes sense to Jason so we have it. I have long been a firm believer that Linux is the future of PC operating systems but unfortunately that day is not here yet, it is coming slowly though, Steam + Proton are making great headway towards it lately though.