@TodePond @livcomp The extra strange thing about these pay-to-contribute charges is that they're not mentioned at all until it's too late https://2024.splashcon.org/track/splash-2024-Onward-papers#Call-for-Papers
They encourage people, including the non-instutitionally funded to submit without mentioning they want you to work for weeks, pay loads for the privilege, and transfer your IP to the organisation unless you pay them even more to host your pdf.
They don't even call it a fee but a "registration", without making it clear that contributors have to pay. They then make it financially advantageous to join their organisation by making membership fee less than membership discount, legitimising the whole thing with high membership numbers.
A lot of academics will only submit to ACM venues because for some reason their field has decided anything else is worthless. Complaining about this is like sitting in your car complaining about traffic..
It is possible to run free, open access conferences without all this exclusionary weirdness!