In my opinion, the problem that you mention is rather caused by a specific interpretation of the tag by "Western" navigation systems that allow users to filter routes based on this tag - and then offer unacceptably bad "free" routes. (In the case of Zambia and also several other countries, it would make more sense to use this tag to trigger a reminder to bring along some money...) If you wish to not delete the tag, please do so but please document your reasons on the discussion page for the key in the wiki.