When letting on a room by room basis, the landlord has the option to stay outside the RTB process, but as above and the quote from the RTB site, the agreement must be clear.Again I would suggest that calling it a license does not necessarily make it so.
If you have a house w X bedrooms & shared facilities; you can choose to select the tenant (Joanne) that will occupy Room N.
You add Joanne to the existing tenancy registered with RTB, removing Joseph who previously rented it.
Thats what letting on a room basis means.
If Room N is unoccupied for 6 weeks, you take the hit on rent.
Each tenant has the protections of RTB / legislation.