The biggest consequence was a settlement payment to those mistreated. Which didn't come out of the police budget or pension so basically they got to force the taxpayer to bail them out for their incompetence after the government already paid over a billion dollars for extra security.
https://www.cbc.ca/news/canada/toronto/settlement-class-action-g20-summit-1.5689329
The mask is just there to hide that we're a vassal state of the USA.