I think it’s that, and also perhaps Taiwanese wanting easier business dealings with SE Asia as a way to ween themselves off of China. I could be wrong though; the former seems likely, after all Taiwanese now fear (rightfully so) that the SE Asians will slowly replace much of them. Given every country’s right to self-determination, it would make sense for them to want to control the foreigner population. Us Westerners are a drop in the bucket compared to the Viets and Thais.