It's disappointing that there's no Linux version. It's a little silly for them to build on top of a multi-platform browser and then eliminate support for 2 major platforms. I had been looking forward to trying this.
They haven't "eliminated" support for other platforms. They are actively working on them.
It seems they wanted to get an MVP out and chose MacOS first. It might be annoying for Windows/Linux users but there's nothing wrong with the approach.