This reminds me of the time when all papers in some journals had this boilerplate at the end: The publication costs of this article were defrayed in part by pa

This reminds me of the time when all papers in some journals had this boilerplate at the end: The publication costs of this article were defrayed in part by page charge payments. This article must hereby be marked “advertisement” in accordance with 18 U.S.C. §1734 solely to indicate this fact. [1] [1] https://scholarlykitchen.sspnet.org/2014/01/09/history-as-caution-when-paid-scientific-articles-were-legally-considered-advertisements/ https://scholarlykitchen.sspnet.org/2014/01/09/history-as-ca...