Metro News just wrote an article about how Google Maps transit planner recommends you take the outrageously expensive UPX if you're starting basically anywhere in the western part of Toronto. Google maps EVEN doesn't recommend you take the much cheaper TTC, even if you're standing at Dufferin subway station, which is on the way to the airport.
Toronto has spent years dealing with the consequences of underfunded public transit. Aging infrastructure, delayed repairs and subway slow zones have all placed pressure on a system that millions of Torontonians rely on. These problems cannot be fixed overnight and require sustained investment in the workers, vehicles, tracks and infrastructure that keep transit moving.