Increased security on mail ids in Google Groups

Today I happened to go to Google Groups to see if there was a possibility of uploading videos or photos. It does give an option on uploading files, but need to find out if explicitly there is a way to upload photos and/or videos.

What in the process was observed is that Google Groups has added increased security in not letting anyone see mail id of any member. In Yahoo Groups, one can see the mail id of a member directly. Whereas in Google Groups, it shows first few characters, then replaces the rest with elipsis '...' appended with @domain name.com. If one has to see the mail id completely, a screen to enter CAPTCHA appears [WHAT IS A CAPTCHA] [HOW STRONG IS GOOGLE'S CAPTCHA]. After the verification here, complete mail id is shown.

Impressed with added security implying extra work for spammers...