Gu Yu was no saint, nor was he that altruistic.
He was merely following his heart, and tried to give ordinary people a little better chance in this new world. Maybe the slimmest chance was enough to change the life of a lot of people, saving them from an otherwise mediocre, unambitious, and unaccomplished one.
When the standard was set, everything became rather straightforward. They didn't have to rack their brains to design the trials any more. As long as the candidate was not abominable and had a natural endowment of the average level of ordinary people, they could be accepted.
Gu Yu set the deadline at one year, after which they would decide who was to stay and who to leave.