Businesses in Ontario can still request proof of vaccination, so it isn't totally abolished - there needs to be a law that says you cannot ask for it
sauce
"The province said in a news release on Monday that, despite removing the vaccine passport system, businesses and other settings may choose to continue to require proof of vaccination.
Masking requirements will remain in place at this time."
https://www.cbc.ca/news/canada/toronto/ontario-doug-ford-announcement-covid19-february-14-1.6350761