Years ago (80s) there always seemed to be glassware from fast food places. Growing up we had a bunch of Looney Tunes glasses, some with McDonald's characters, and I know there were more as well.

They used too but I don’t think they have for years now. My dad used to collect them and while he did wind down over the years as recently as 10ish or so years ago my mom was still getting them for him, but it’s been a loooong time since I’ve seen one of those promotions running to the point where forgot about them

They sell burgers and sometimes throw in a free glass as some sort of promotion, usually involving a movie.

Then people sell them on eBay.