I don't really understand the question. It's already on steam. This is just spreading to another platform. Fwiw, it's also on Desura.
Honestly, because I have been a fan of itch since I first heard about it when I was doing a Ludum Dare. When I found that it had been turned into a proper platform, I was THRILLED. Since getting the process started, I have come to realize exactly how cumbersome and antequated the steam build system is.
The itch build system is far superior in every way. I sincerely wish steam would get their act together. That said, Itch is a very large community of open source players and developers. These are people who are probably better equipped to deal with a game that doesn't have a 60 million dollar budget behind it with a tutorial that holds your hand every step of the way. I'm not disparaging steam users here, but you know as well as I do that many of the people that come from steam literally have no idea how moving a unit around on the map works.
Without a ton of developers and people making tutorials and stuff like that, it becomes very hard to teach. This is why I have put so much effort into the wiki and youtube tutorials. In the hope that people who aren't familiar with RTS games might watch them.
Also, with this being an open source community, it is more likely that they will be more forgiving of shortcomings (like our lobby, which isn't exactly that easy to use). I try hard to mitigate these shortcomings, but the fact is, it's my hobby, not my day job, and as a result, there are limits to what I can accomplish.