Freedom of speech applies to everyday citizens, not members of the government. It's still a government's job to protect the interests of ALL members it serves. Politics, whether people like it or not, is a profession, and like any profession (whether it be politics, medicine, engineering, or law), there are many cases that exempt you from a free speech clause. Metrolinx is a crown corporation and should be considered an extension of QP. The fact that Metrolinx is pursuing OL advertising (regardless of it's on IG) with taxpayer funds is:
1) A huge conflict of interest, which should be enough of a reason for it being illegal
2) Unethical — indirectly spears political opponents and influences public opinion
3) Without due process and lacks accountability
4) Extremely misleading, giving the impression that the government is actually building something when, in fact, little more than an idea has been written on a piece of paper.
This is an extremely dangerous precedent for any western democracy, especially Canada.