https://screenrant.com/seinfeld-theory-characters-jerry-apartment-reason/

This fascinating fan theory explains why Jerry's apartment was the main hangout spot on Seinfeld and sheds light on the show's relationships.

They block me because I bock ads. Who needs them anyway. The answer is because Jerry is neat and the food is free!

I skimmed it. They did say it's always stocked with cereal, free food. But the reason given was that Jerry goes out of town often so he's always returning and his friends are thus always stopping by to welcome him back home. Whatever.