When the train leaves, some people miss it. They then use the app to hail a ride. The increased demand leads to a corresponding increase in price. This is how surge pricing works. What you seem to be suggesting is that this is inherently predatory, but it seems more likely that it’s just the result of a large number of people requesting rides at the same time.
What I am suggesting is that whether or not the people are predatory, they created a system that is mathematically predatory.
In the pre-Uber world taxis would line up, the fare wouldn't be any different whether or not it is just after a train left, and more drivers would just know that there is higher demand at that location at certain times, without fare surges.
I do love being able to hail rides with a phone app, but I detest this fluctuating pricing.
It reminds me of why I like train travel in other countries but not so much in the US: In almost all of Europe and Asia, train tickets are fixed price based largely on distance travelled and class of train. In the US, Amtrak plays the idiot capitalist game of predatory money grabbing you if you need to make last minute emergency travel plans or changes.
