The province of Ontario has rent controls and I never heard of it as an issue in the ~7 years I was renting there. I guess it helps that most towns don't have market rents growing way faster than inflation.
That's because Toronto has no problem allowing lots and lots of new skyscraper condos to increase supply.
New buildings are exempt from rent controls. Rents on a unit also reset to market rate when a new tenant moves in. And Toronto is also the only place in Ontario you really hear about soaring housing costs. So rent controls are a fairly limited phenomenon here.
Rent control in Toronto is a godsend. Housing prices may be out of control but rent is still reasonable.