I use my own OpenID, because I'd prefer not to be dependent on a particular provider. (Of course, my website just delegates to somewhere else, with a single line in the section.)
For some reason, climatedeal.org has disabled login using arbitrary OpenIDs. (It's enabled by default in the StackExchange software -- I help run another such site, so I know how this works.) This makes me sad! Is there a reason for this? Could you restore the URL field, perhaps below the icons for the "big" providers?



