I think it's somewhat understandable given it's a long way out of Taipei City and there's no guarantee of being able to find a return fare.
If there is no guarantee of a fare back, this kind of pricing is not sustainable long-term.
It was still dirt-cheap compared to a equivalent trip in the US.
... and all of a sudden, you are back to taxi pricing.
Uber was an enormous improvement in SF and in Beijing (where there just aren't enough cabs). In Taiwan it's a sizable step backwards.
So it's not unreasonable that taxi drivers charge a special rate. It's a lot of extra hassle.
But I'm surprised Uber actually took you there.
Do they technically serve the whole of Greater Taipei?
"The third and most mysterious piece of non-absoluteness of all lies in the relationship between the number of items on the check, the cost of each item, the number of people at the table and what they are each prepared to pay for."