> You do not retain the copyright, and the only permission you get is to share it for classroom use with some other constraints. Authors posting them on their university websites is a grey area that is likely non compliant but it would be really bad PR for ACM to go after such instances.
See https://authors.acm.org/author-services/author-rights the options that authors have, including "Authors who prefer to retain copyright of their work can sign an exclusive licensing agreement, which gives ACM the right but not the obligation to defend the work against improper use by third parties."
And the copyright block in one of my papers as an example: https://jeffhuang.com/papers/SelfE_CHI21.pdf which says "© 2021 Copyright held by the owner/author(s). Publication rights licensed to ACM." (there are no fees to choosing this option, by the way)
>> the executive salaries are $0 as far as I know
> I have no way of verifying this, but clearly the money is going somewhere and it's not publishing.
Here's an article by Vert Cerf saying that all ACM positions are voluntary and paid $0/year, if you want to believe him: https://cacm.acm.org/magazines/2013/5/163764-acm-presidents-...
>> It's not completely free because there are real costs to publishing
> The amortized cost of putting a pdf on the internet is close to 0.
Yes and posting a jpeg on the internet is close to 0, yet AirBnB still charges a fee for their service. The publishing process (including coordinating peer review and development of multiple web apps) has more costs than hosting a pdf. You're welcome to review the non-profit filings for ACM/IEEE if you're genuinely interested in what the money is spent on.
And you're always able to upload your pdf to arXiv regardless of what you do with ACM, "an example of a site ACM authors may post all versions of their work to, with the exception of the final published "Version of Record", is ArXiv" [https://www.acm.org/publications/openaccess]