If humans disturb animals in a location then those animals will move to a different location.
A small number of unscrupulous whale watching companies were also taking their clients too close to the animals and causing disturbance.
Whales will move to a new location  due to whale watching boats.
What can cause whales to move to a new location?

Earth orbiting the Sun
movements in the earth's crust
embarrassment
Temperature changing
tax rates
whale watching boats
unemployment rates
mechanical waves