Not sure, but perhaps it's because they've been forced to flee their original home and settle in an unfamiliar solar system?
The Arceans and Torians are in new solar systems, but they don't get it.
Do you mean the screen that says you've set foot finally on a new world? From what I've seen you get that with any civ if you colonise a planet in your own solar system (Mars etc.)
No. That is the First Colony screen. The Colonizing Event screen allows you to make an Ideological Choice. I can choose Benevolent, then choose to get a free colony ship. On turn #1 I have a new colony and still have a colony ship. This one has 5.0b colonists instead of the 2.5b on the original colony ship. It is a nice exploit advantage.