Help me understand why we don't see more boarding houses pop up to address the US housing shortage.

For the purposes of discussion, let's use the wikipedia definition for a boarding house:

a home "in which lodgers rent one or more rooms on a nightly basis, and sometimes for extended periods of weeks, months, and years. The common parts of the house are maintained, and some services, such as laundry and cleaning, may be supplied. They normally provide "room and board", that is, some meals as well as accommodation."

It seems to me like an affordable, furnished room in a house with common areas, laundry facilities, and shared meals would be very appealing to young people, students, single workers, couples moving to a new city, new retirees, etc. But boarding houses are increasingly rare and not generally seen as desirable or respectable living situations. What gives?

EDIT: listing the most common replies to this post, please check before just commenting "zoning" like 20 others already have!

Common replies

• Zoning: Many municipalities limit the number of unrelated people who can live together in a SFH.
• NIMBYs: Generally opposed to any and all dense housing. Will oppose rezoning efforts and snitch on people attempting to rent to more than the maximum allowed unrelated persons.
• Boarding houses still exist: Some commenters feel that boarding houses still operate, but in an illicit/underground manner. These arrangements may be more common in immigrant and ethnic communities.
  • This is a valid point, but the boarding house model is still vastly less common than it used to be in the US.
• Nobody wants to live in one: Hard to substantiate this claim.
• People have changed: Some say that people are too irresponsible, dirty, antisocial, etc for the boarding house model to work anymore.
  • Hard to substantiate this claim. Are people in the US socially worse than they were 100 years ago?
• Tenant protections: Some commenters say that tenant laws would make it impractically difficult to evict problematic tenants for non-payment or antisocial behavior.
  • I'm personally very pro-tenant, but I think there may be something to this. The boarding house model necessarily involves lots of shared communal space. Someone operating one would need the ability to manage the people living there to create a positive community.
• They are dens of crime and drugs: This viewpoint has been shared many times and doesn't add anything productive to the discussion.
• Technology: Services like laundromats, cheap laundry machines, and low-cost food have reduced the need for the additional services boarding houses used to provide.
• They've been replaced by motels/hotels and AirBnBs