These clients doesn't realize that they might actually pushing away good & brainy participants into their project with such lame rules.
How hard is it to just hide the email address column in public and make it visible only on spreadsheet owner and staffs.
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I've only experienced this once and it's my fault that I didn't check the available info on spreadsheet.
After some attempts for a change request, I ended up quitting the campaign because both the manager and other co-participants are unresponsive. It's such a waste.