It is less about being “lazy” than it is about being understaffed and the ice cream machine having a very labor and time intensive cleaning process.
I know this is The Internet, but could we maybe not shit on overworked and underpaid labor? Since, that is the whole point. Corporate McDonald’s and the companies with contracts to maintenance those machines actively want all of your ire to go to the 19 year old night shift manager rather than actually question the fundamental problems with this setup. And a lot of the issues plaguing this are the same that plague you in your comfortable home.
ifixit.com/…/whats-inside-that-mcdonalds-ice-crea… is a good article on these issues and why it is, like most things, a problem of lobbyists and corporate interests. That you chose to blame on the workers.