India is at #9 and it's very common here too. It's become even more so in the tech sector after remote work. Almost all of my single colleagues live with their parents. And even some of the married ones live with parents or in-laws.

I can understand the appeal - no rentals to pay, way lower cost of living if the parents live in a non-metropolitan area, and - if you have kids - you have someone to take care of them during your meetings.