There's no point in getting up in arms about provincial revenue source being lost with the disappearance of plate stickers, it is not accurate information. As per
CTV Toronto, the official numbers for 2018-2019 by the Ontario Financial Accountability Officer (FAO) indicated that the program brought in $1.95B, but cost around $2.4B to run, resulting in a net loss of approximately $436M. The program costs more to run than the amount of revenue it brings in on a non-pandemic year. Losses are likely much greater for 2020 and 2021. In the same article, the FAO says the impact to the province from cutting the program will be a loss of approximately $1B, but I think they are referring to the
up-front cost of refunding everyone's plate stickers,
not an annual cost to the province. This means that assuming the program racks up similar losses, the cost of refunds and removal of the program should pay for itself in roughly two years.
With this information, it makes perfect sense to cut the program. In fact, it should have likely been cut years ago. Think of it as a down payment on either approximately half a billion less on the annual deficit, or half a billion more in potential highway or transit funding each year. The real questions people should be asking are: how long was the program unprofitable for, and why was it left running for three years after it was not seen as profitable in 2018-2019?