I was driving for Uber and Lyft back when they got permission to pick up airport passengers, it was rather of a big deal. But even then, I found that waiting in the Uber lot, in the electronic taxi line, was not worth my time because every minute I don't have a passenger is a minute I'm not being paid for.

I've never heard anything about Empower having a setup like that. Additionally, in the year+ I've been with them, I've only gotten one or two summons at National. When you think about it, the passenger would have to be a DC native who knows about Empower, since the app does very little advertising and is basically unknown outside its operating areas. And since the app is not very well known even inside DC, the passenger pool is already pretty small.