Would you be opposed to SE implementing a program to scan for addons/parsers?

[Kazhar]

I don't understand why players use ACT on low-end content either. It's honestly daft, especially the ones who choose to plug them into FFLogs... like... honeys... what's the point of knowing how much damage someone did on one single Normal Raid? There's no point, and FFLogs enabling it is just as dumb.

Some players just have ACT open for everything they do in a day, which includes casual content, and uploads them in bulk along with their raiding activities because it's simply easier.
If you see you were logged in a dungeon, it's most likely the reason. Almost nobody takes dungeon parsing seriously.
(Normal raids and alliance raids are a bit more popular to actually parse for reasons Rein already explained, even though it's still a niche usage)