Clanless clans (the void) /no invite option.
I think that there should be a separate chat for people who don't have clans. This chat will be called the void and will only be accessible by people who don't have clans. There will be different servers just like global, and players will be able to request troops to other clanless players. This will be a good social option for people who want to stay clanless and also don't want an endless stream of invites from clans. Or you could create an option in settings that blocks all invites, along with the void. This is an awesome idea.