I had dinner in Seattle last week and the waiter did not mention the 20% service fee. The way the bill was delivered in a suspiciously folded manner, one would

I had dinner in Seattle last week and the waiter did not mention the 20% service fee. The way the bill was delivered in a suspiciously folded manner, one would have had to dig through to find where it was printed. I tipped 20% on top of what I thought was the dinner bill and didn't connect the dots until the next day. I called the restaurant and addressed it privately but I do wonder how many people are blindly taken advantage of by what could be considered an analog dark pattern and never catch it.