I grew up in New England where Dunkin Donuts is almost a religion, right up there with the New England Patriots. I wasn't excited about Krispy Kreme at all because I grew up with good donuts.
One of the first things I remember as a kid in the 1970s was reading the "no tipping" sign at Dunkin's and asking my parents about it. So it has been a policy there for a long, long time.
(Funny they put a Dunkin's in on my side of town a few years ago, I don't know how many people know the supermarket across the street makes better donuts, which is truly unusual.)
We had a Starbucks in Collegetown which went to only taking mobile orders during the pandemic which meant I pretty much quit drinking coffee there. Not long after Starbucks closed the location to bust the union that was forming there. In my mind that area is a "coffee desert", I mean you can get coffee but so far as I can tell the best coffee is at 7-11 and everything else is much worse.
Order, pay, pickup, done. No tip expected (though nobody stops you).