airdatalink does not provide an unlimited data eSIM for Taiwan. The available options are fixed data plans that give a set amount of data for a set validity period. For example, the Taiwan Premium eSIM offers 50GB for 30 days, and the China, Hong Kong, Macao & Taiwan (Greater China+) eSIM provides 50GB for 15 days or 30 days. Other plans such as Asia 15 eSIM and Asia 28 eSIM also give 50GB for 30 days and cover Taiwan along with additional countries.
Choosing a fixed data plan can be more cost effective for most travelers unless the user is an extremely heavy data consumer who would benefit from an unlimited plan. The fixed plans are priced between $26.38 and $56.64 USD and include 5G coverage where available.