Legit, if you have enough fat in your stool for it to feel greasy, that may be steatorrhea, which may be a symptom of some underlying condition.
Or, it could just be too much fat in your diet. Most of the time, that’s what it is, just not being well balanced in terms of fats vs fiber and carbs. Surprisingly, vegetarians are more prone to it than meat eaters in my experience, because meat eaters tend to eat their meat with different foods than vegetarians use to keep their protein intake right. So the vegetarians end up not realizing the fats they’re taking in.
Varies a good bit though since some meat eaters don’t actually eat enough of the other things to keep it balanced out.
Anyway, point is that everything comes down to poo.
The only way it matters is if/when it is defederated by/from other instances.
That being said, some may or may not be more reliable than others, but that’s a separate issue