Comment by sanswork
$3 is small enough that almost everyone will just eat the cost. I have a theory that they do this intentionally in some things(well Uber I've never used lift). Almost every time I order food and something is wrong or missing they'll give me a refund that is $2-3 off what it should be. Like if I order a $5 item and it's missing their service will refund me $2. At that point I can chose to spend literally an hour going through different support flows to try to reach a human who will correct it and give me the extra $2 or I can eat the loss. It's happened to me at least a dozen times now so I imagine it's common enough across the whole world to add millions of revenue each year.
Speaking of small costs, some time ago I paid 2 euros with my credit card in order to enter the central train station toilets in Milan, Italy.
The toilets were awfully dirty, there was no toilet paper and no soap. I took some pictures just in case, then I filed a chargeback with my bank. After some weeks, they gave me my 2 euros back, and the company that manages the toilets probably paid a small fine to MasterCard or whatever.
Was it a waste of time, for just 2 euros? Sure. But if nobody starts complaining, nothing will ever be fixed.