Why are they doing long-term jeonse in Gangnam?

The "Mirinae House" apartment system, introduced by the Seoul Metropolitan Government in 2024 for (prospective) newlyweds without homes, is a public rental housing program that offers incentives such as a maximum residence period of 20 years if a child is born after moving in (with the option to purchase thereafter), and exemption from asset and income criteria upon contract renewal. In particular, households that have three or more children after moving in are granted a right of first refusal to purchase the home at approximately 80% of the market price after 10 years of residence, leading industry experts to count it as one of the means for the middle class to achieve homeownership.
Why are they protecting people who are capable of paying over 1 billion won in jeonse deposits?
What is the meaning of this?
They should just abolish it.