Yes they gave you a mug as part of your Magic Your Way Pass (??), it was an incentive to book everything through Disney and last time I actually stayed on property with that MYWP was 7 years ago when I noticed the chip change- they also gave the mini golf passes and some other stuff like discounts here and there shops/restaurants. You don't get it for just booking room. You had to book the room, park passes etc.. to get that deal as part of your Magic Your Way Pass vacation. They gave little vouchers with your ressies where you go to resort restaurant (breakfast place) and get your mug - free refills the rest of your stay.
I know others that have brought that mug back every time (as old and yucky as they were) and stayed off property and would go to a resort to fill up before heading to Parks. So it was a thing.
About 10 years ago they chipped them so you could only use the mug for the duration of your stay, it had some expiration date chipped in so when you pay, it would ring up soda, Also you could buy them but you paid for how many days you were there - but you keep mug. They still gave them out with MYWP with chip back then (or what ever they called it Magic your way something....)
They never used to have a chip so people would book outside property bring old mug and fill up in resorts, or get tix elsewhere etc.. Bottom Line Disney wanted to save money and stop people from refilling and sell mugs to those who didn't book through them.
Reminded me of the way Disney loosely writes their perks and leaves it up to interpretation. So perhaps they are trying the same on boat with beer mug.... only good for your cruise, thus they are starting with we don't accept tokens have to buy a mug... and testing the waters so to speak. Kinda like that thread on the coffee cards...
It all points to they are looking to save $$$$ by getting rid of perks that may not have the incentives spelled out clearly:
"Carry this Disney Cruise Line-branded beer mug to any onboard bar and get a 21 oz. refill of beer for the price of a 16 oz. size! If you find the mug too heavy to carry while onboard, then take advantage of the beer mug token."
See it says "while onboard"; could they now take that loosely translated perk and say while you are onboard ...this cruise..... Sure they can and we lose another perk but it was always written while on board. So they could say it was always their intention to be the specific cruise and they have been nice all these 19 years and let it slide, but it is time to implement the rule that was always written.