Self check-out stations, ATMs, and online brokerages. Recently chat support. Namely cases where millions of people used to interact with a representative every week, and now they don't.
"Name one use of electric lighting that hasn't resulted in candle makers losing work?"
The framing of the question misses the point. With electric lighting we can now work longer into the night. Yes, less people use and make candles. However, the second order effects allow us to be more productive in areas we may not have previously considered.
New technologies open up new opportunities for productivity. The bank tellers displaced by ATM machines can create value elsewhere. Consumers save time by not waiting in a queue, allowing them to use their time more economically. Banks have lower overhead, allowing more customers to afford their services.
If I had missed the point I would have given a much broader list of examples. I specifically listed ones that make employees totally redundant rather than more useful doing other tasks.
When these people were made redundant, they may very well have gone on to make less money in another job (i.e. being less useful in an economic sense).
