Why only two distilleries left in the world's whisky centre? 世界威士忌中心為何只剩兩酒廠

When learning about Scotch whisky appellations.
We'll find a small region called Campbeltown.
It was once the whisky centre of the world.
But why are there only two companies（three whisky distilleries)...
學習蘇格蘭威士忌產區的時候，
我們會發現一個叫Campbeltown的小產區
居然號稱曾經的世界威士忌中心
但為何只有兩家公司（三家威士忌廠）...