In big cities like Shenzhen

Many companies do not provide meals or accommodation
There is not even a cafeteria
Rent is still very expensive
An employee just found a job
And has to rent a house themselves
And spends dozens of yuan every day on fast food outside
But why does Shenzhen still have so many young people
Most of the people seen walking on the streets are young
What exactly attracts so many young people to Shenzhen, and what is the reason that makes many migrant workers willing to ignore living costs and rush in?