Oh, where did he say this? IIRC, he always said that any OA model for ACM requires careful thinking about a sustainable business model. In 2009 he argued [1]:

Oh, where did he say this? IIRC, he always said that any OA model for ACM requires careful thinking about a sustainable business model. In 2009 he argued [1]: > "Indeed, the idea of unfettered access to scientific knowledge naturally resonates with many researchers, including me. So why doesn’t ACM become an open-access publisher? [...] ACM operates as a democratic association. If you believe that ACM should change its publishing business model, then you should lobby for this position. [...] The second issue is the business model of association publishing, for example, "reader pays" vs. "authors pays." This is a legitimate topic of discussion, as long as we understand that it cannot be separated from the overall business model of the association. Just remember, "free" is not a sound business model." In 2018 he wrote [2]: > "If we are serious about open access, then we must discuss its underlying business model. Let’s get serious about open access!" [1] https://cacm.acm.org/opinion/open-closed-or-clopen-access/ https://cacm.acm.org/opinion/open-closed-or-clopen-access/ [2] https://cacm.acm.org/opinion/open-access-and-acm/ https://cacm.acm.org/opinion/open-access-and-acm/