One less thing I’ll have to worry about when I get to the US. Will tipping still be a part of getting a free drink do you think though?
Very much so. Going rate is a dollar bill per drink.
Pro tip: if you're at a (regular, not-airport) bar, the tip for the first drink is 100% of the drink cost - ensures v prompt service for the follow up beverages (which you'd revert to $1 tips for)..