Why do you think most early adopters use Windows exclusively?

I'd hazard as guess that Linux users are at least a magnitude more likely to be an early adopter of this project than Windows users, at 4% market share it shouldn't be that big of problem at the start.

The average Windows user would easily be put off by the project if they tried it this early. I feel it'd actually be better if they don't release on Windows until they are ready. That way they can get better press when it finally releases on Windows.

They do not need early adopters yet. They know it is too early. It makes sense to focus on progress. Outreach can happen later when they are more technically ready.

If you are tech-savvy and looking for alternatives, you won't use Windows.