I have even created a support request about that, and got the following (in my personal opinion not so bright) answer from the support team (removed all personal data):
28/Jan/16 8:43 AM
Thanks for pointing that out.
First of all, my apologies for the incorrect information provided above. Yes, you're right, the css code above does indeed hide other message as well, but the css code below doesn't, it only hide the license reminder banner :
About the question above, unfortunately this is one of a UI bug that's bugging you, there's no way to give the reminder an exact time frame as of now. But after applying this, the message will only appears while you're in admin mode.
Hope this helps.
If you're using our OnDemand service, that is the default message that we have there. If you're using Confluence Sefl-hosted, we might have this message under the Confluence admin area, so other users shouldn't be able to see it.
I hope this helps.
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