It's not a full product yet, it's an alpha. It's normal for products in the alpha stage to have not just monthly, but weekly or even daily/nightly builds.
Pros:
- You get to work directly with the alpha testers and quickly react to the bugs or game design flaws
- You don't have to backtrack a whole month or even more to fix things, rendering hours of man-work pointless
- The community stays engaged in the upcoming product
Cons:
- People get to play buggy, unfinished builds (solved in the previous century with the concept of stable/nightly builds)
- Supporters will notice you lazing out for a few days