Final answer:
The advance encryption provided by BlackBerry Messenger can be a disadvantage for some countries due to its data security features.
Step-by-step explanation:
The advance encryption offered by BlackBerry Messenger can be a disadvantage for some countries due to its data security features. While data security is important for politicians and business people, it can pose challenges for countries that prioritize surveillance and monitoring of communication channels. These countries may view the encryption as a hindrance to their ability to access and monitor data for security or intelligence purposes.