I've been getting at least one a week. I complained last week to Flickr and got this in reply.
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Hello Tommy Weir,
Thank you for contacting Flickr Member Support.
If you know of any Flickr accounts that you feel are in
violation of the Flickr Community Guidelines, please let us
know by going to that page and using the "Report Abuse"
link. We'll review the account and take the appropriate
action.
Thank you again for contacting us. If you have any other
questions, please feel free to reply to this email.
Regards,
Flickr staff
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I think I mistook them for people who cared.