And where is it going? What resources does it contain? Is it even stable enough for mining, "colonizing" or propulsion? Were we able to catch up with it and land on it like on Bennu, an asteroid in our ecliptic plane whose orbit is relatively easy to reach from Earth?

We can't even send people to Mars and have them survive there.

It would be way easier (but still very hard to impossible) to go find a fitting asteroid in our neighborhood and turn that into a spaceship and accelerate it out of the solar system when everything is in place, than trying to catch a ride on some unknown object on a pretty unknown trajectory.