Normally the guest editor or developing editor is responsible for recruiting contributing authors to submit to the special issue. It is not an easy job for them to find contributors, as well as finding reviewers to review the manuscript. Most of them know each other in a remote connection. If you are out of the circle, then do whatever you gonna do and leave the decision to the editor, but try to be professional on being a judge. If you are in the circle then I guess you know what to do.