The article doesn't make this clear... is sharing a house illegal, or is it only illegal to separate leases for each room? Immediately post-college, I shared houses with other 20-somethings. It was always a single lease - 4 roommates listed, 4 beds, all of us responsible for the full amount of the rent. But, we were absolutely allowed to reside in the same home. Same thing in college - single lease for four people in…
A private bedroom but shared living/cooking space is generally called a rooming/boarding house:
* https://en.wikipedia.org/wiki/Boarding_house
* https://www.toronto.ca/community-people/housing-shelter/mult...
There is a separate contract with each tenant (i.e., multiple contracts), and each tenant is only responsible for paying for their private area.
This differs from a roommate situation in that there is generally one contract with the entire group.
Similarly with subletting: there is one contract with the landlord and the 'main' tenant, and then that tenant then turns around creates separate contract between them and another tenant.