The ground transport network in Europe is so efficient that cargo can move quicker from door to door using surface transport than it can by air.
Asia is a better market with limited surface options, congested sea ports and greater distances.
Even low value cargo such as fruit and vegetables goes by air. The flight is paid for already by the passengers so as long as the extra fuel and loading costs are covered, attractive rates can be offered and a profit made. The cost of a live crab in the Philippines compared to its final price in a top Hong Kong restaurant leaves a considerable margin to cover transport costs. Even mangos can be worth uplifting in India when the aircraft is already operating the route anyway, but this may not be profitable with a dedicated freighter.