Please be aware this rule is being fully enforced FROM the 7th of June-you are currently in the grace period (the week preceding means the week before) and that from the 7th silences will be given to those breaking this rule.
I can see that there is a lot of mixed opinions about this rule, concerns about people accidentally posting too many within the time frame etc, and this is why the grace period has been put into place to allow for clans to prepare and put advert management systems in place.
All suggestions for game improvements should be emailed into
support@athinkingape.com or by using the feedback function within the game for the developers to look at.
It has to be remembered that this idea has not just been plucked out of thin air, ATA didn't just wake up one day and decide "hmmnn.. What shall I do today-I know, I'll try and stop people from posting adverts to join their clans", this idea has come from player feedback to try and make things run more smoothly.
With regards to the many suggestions to create an advertisement only channel, I too would love to see this, however I'm not a developer and I have no idea how much work this would be to get it working!
My advice for now is to run EB's suitable to your clan size to finish, and for clan owners and admins to manage advertisements. Good strong clans which will last are rarely built from mass advertising in my opinion, but grow naturally with strong bonds and become more like a family than a business of churning Epic Battles out.
If you find your clan in a position where it looks like your failing, then contact friends early enough to make a difference, and remember, they are probably doing an EB of their own so may take some time to get to you.