Kilimanjaro is a major source of tourist revenue and income for Tanzania. The local government naturally has an incentive to keep a clean safety record in order to attract more climbers. Therefore, local tour operators are encouraged by the government to keep safety incidents on Kilimanjaro confidential.
Moreover, no tour operator would voluntarily want to disclose their own records. Because even if they are much better than any competitor, it would create the perception that they don’t have good Kilimanjaro safety practices if they are the only ones disclosing those incidents.
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