In Europe everyone charges what’s needed to pay the staff, with varying tip/no tip cultures. There’s no added risk. In the US unless everyone suddenly switched at once (eg. making tipping illegal overnight) then the restaurants that increased prices would be taking a financial risk because it might drive customers away.
In truth, food price probably works out about the same anyway… in the US the menu price has service charges tax and another 20% added on top of that for a tip. In Europe the price on the menu is what you pay. . it already includes everything except the tip, and tipping is voluntary for good service (depending on country, Europe isn’t one culture).