

Yeah, that’s kind of the advantage and disadvantage of Markdown. It’s so simple that alternative implementations can be easily created, which helps with adoption. But because those alternative implementations exist and because there is a need to add more features, those alternative implementations will see custom changes for the format, ultimately making the format less standardized.
The difference is the amount of trash and that more of it is not organic, so will not break down. A small hole in someone’s garden, which largely decomposes over a few decades, is a very different thing than a mountain filled with trash that stays there for the next generations.
For example, groundwater can get contaminated by landfills, if they’re badly planned, or when an earthquake tears the ground under them apart.