Been flying back and forth DFW-DEN the past few weeks. Most flights, I have been in MCE. First time I did it, I ordered my drink. FA told me how much it was. I pointed out I was in MCE and drinks were no charge. That was that and no issues. Other flights where I was in MCE and ordered a drink, no problem. I haven't always ordered one, though. One flight DEN-DFW, there was no drink service. This past Friday, I just decided not to have one.
So, overall, it's been a fine. They never have offered free booze. Also, it seems like not may other PAX take advantage. Guessing many have no idea.