“the Amengi, a race of creatures that enslaved the much smaller, and weaker ancestors to the Yautja. After generations of evolution, and being bred to fight in gladiatorial style games, the Yautja were born. The largest, and strongest of the fighters had led an uprising, killing off the Amengi, and freeing his race from their enslavement. This new leader was known as the first hunter, and became the alpha Predator, wearing the near impenetrable skin of the Amengi (aka the unused Predator design), as his armor and mask.”
So as you can see, that is why Predators hunt all over the universe, they enslaved their old masters forcing them to build Star ships for them, using their technology to show that they are not that weak race that was conquered all those years ago but a force to be reckoned with upgrades with their genetic enhancements, taking trophies for their genetics till they become to OP and look like this