First Amendment
Marketing agency has standing to challenge content-based restrictions on commercial speech, even if the speaker is determined to be the company selling the goods or the institution serving the goods.
Content-based restrictions on speech must withstand heightened scrutiny.
https://d3bsvxk93brmko.cloudfront.net/datastore/opinions/2016/01/07/13-56069.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.