Speaking as an occasional contributor: there's a roadmap towards that, but there's a few components that need to finish baking before we release on Steam. e.g. the current lobby protocol isn't capable of handling Steam levels of traffic, so we are working on replacing it.

You only get one chance to make a good first impression, and if the server melts on release day, that's not a good first impression. :)

The Hooded Horse deal is expected to provide some professional development time to help knock out these blocking items.

https://www.beyondallreason.info/development/steam-release#M...

https://www.beyondallreason.info/news/beyond-all-reason-and-...

The current version isn't on steam due to a variety of (mostly infrastructure related) issues, the free version _will_ be on steam in the future though you will still be able to get the free version from the website for those who want to avoid steam.