I uploaded the sourcecode of the mod to github.com (https://github.com/MarcGamesons/factoriomod-cheaper-landfill).

Remember that you can do whatever you want with this mod!

I made this decision from the beginning so that people are allowed to update this mod in case I suddenly disappear (e.g. I don't play the game anymore and moved on to other games), so other people would be able to update it. But this obviously means that you can use my mod as a part of your own mod too. You don't even have to give me credit, because this simply is a recipe edit and everyone who would only change this one recipe would have the nearly the same, if not the same sourcecode as me.