Droid Hams

So I tried to join the Droid Hams Yahoo Group, but I missed the fine print (see below) and was denied.

Description
Droid users that are licensed hams
If you want to join present your call sign otherwise you will be denied

Since I tried to sign up using my Brick account and without mentioning my call, my request was denied. I don't dispute the group owner's right to restrict access, but I think the more open groups have a better chance of success. My supporting data... this group had one message in August and one message so far in September. Not too active.