Edit. I'm an idiot.
the build you get are for your use only (i think).. but you do get 5 downloads so...
idk on Tynana can say TBH
It's piracy unless they buy a copy of the game, IIRC. You can get it off the website (rimworldgame.com (http://rimworldgame.com)), so it's just as available as any other game that exists.
I'm going to file this under "silly questions people ask".
But I wouldn't share it, no. There are so many gameplay videos out there that the only reason you'd need to "try" the game before buying is if you anticipated needing a looooooong time to make your decision. >.>
It's not so long till open, too... right?
Each person who plays should buy a copy. Feel free to install your copy on all your own personal computers. If you share your computer, everyone who uses it can, of course, play the same copy. But a different person on a different machine should buy their own. I won't create DRM to enforce this but it's how this is supposed to work.