I was invited to answer one of these, at a company with truly the most hateful manager I've ever had. Oh, was I ever ready to offer my jaundiced, embittered opinion...until the survey required I log in with my company email address.
Yes, there was the usual verbiage about anonymizing, blah, blah, but I lost all confidence that my response wouldn't be tracked to me. I never returned the survey.
I still haven't determined whether this was by incompetent or malicious design.
There was a post on here years ago from somebody who sold software to corporations for "anonymous" employee surveys. He said that executives always wanted to deanonymise the results and, sadly, he was happy to oblige.
Yes, there was the usual verbiage about anonymizing, blah, blah, but I lost all confidence that my response wouldn't be tracked to me. I never returned the survey.
I still haven't determined whether this was by incompetent or malicious design.