They were never a thing in Europe.
The sewage treatment is not built to handle that kind of stuff. The sewage pipes aren’t too happy about it, either. I might flush some carbs down the toilet. The poop-munching bacteria at the treatment plant get a nice growth boost from it. Grease not only clogs your own pipes, but causes issues for the whole city. I think it’s possible to get fined for it if you’d get caught starting a year or two back.
Food waste goes in the trash or compost. If it goes in the trash it’s burned at industrial temperatures to burn clean. The heat is used for district heating networks.
Louis Theroux tried to make a documentary about them. He’s done some really good work showing the worst groups in the world as, you know, actual human beings. Like the westboro baptist church.
The Scientologists refused to talk to him. Him talking to ex-members unleashed a stampede of harassment both against them and him.
The result is called “My Scientology movie”. It’s worth a watch if you’re interested in their techniques to keep people from leaving.