Since it was a relic type ruin, then it meant that humanity had a chance of capturing the ruin as well… However, that chance was small, considering the other space civilizations humanity had to fight for it.
If they lost… well, that was dependant on whether the ruin's owner was kind or cruel. Either the losers would be allowed to leave safely or they would all become sacrifices for the winner. It would make sense for it to be the latter, as the lives of several billion space civilizations would be decimated to be turned into soul for the victor, allowing the victor to reach its full potential. This combined with the reward provided by the relic type ruin would allow the victor to become a high tier space civilization as soon as possible!
Therefore, humanity shouldn't bank on other people's kindness. There was only thing for humanity to do, which was to survive no matter what and try its best to be the final victor!