Presumably most of the bounty participants are not using their main email accounts but I do agree with the OP as I do not see a necessity to expose the list of email addresses for public.  Even if they want to use the email addresses to update new information etc for bounty participants, of course they can keep the email addresses in their database, rather than expose them for general public.


Maybe we should list up such bounty campaigns like above and let moderators notice the situation and consider a new rule.