Considering an event with a double masked (i.e. double "blind" process), should an anonymous submission include acknowledgments to people who helped with the research work but denied to be co-authors, or wait for the final version to include such acknowledgments?
I assume not: if they are asked to be referee and feel there is a conflict of interest, they will just declare so, leaving the doubt whether it is because they are an author or just a contact, which will nicely help with the authors' anonymity.
On the other hand, I hope such people will realize that they WILL be acknowledged in the final version and not assume that no proper credit was given to them!