You can file a complaint with the city of toronto, for the fencing and safety issues. Call 311 or e-mail
311@toronto.ca.
About the fact that older or physically disadvantaged people will have difficulty using the garbage, I think that the Ontario Human Rights Tribunal may be able to help.
https://tribunalsontario.ca/hrto/ I don't know how you file a complaint with them, but maybe you can find out how from the website.
Does your building have a tenant association? You could send a letter to your landlord asking them to provide somebody to carry out the trash for people who can't use the temporary garbages.