This episode https://www.youtube.com/watch?v=g2BtvivdbOw may be relevant to how "forced" is used in the original comment. The video shows villagers collecting trash off the sides of a remote highway to keep the land clean. On the face of it the video looks like a volunteer/community service outing but villagers are actually paid. It is not the most pleasant work, but they look happy to be doing it (and probably do not mind keeping their environment clean). The Quora answerer could have used "forced" to describe the same scene out of a sense of sarcasm (since everything is presumably "forced" there) and he would likely be tickled that this brings slavery into the discussion.
If it is forced labor, even if paid, the distinction between forced labor and slavery is trivial compared to the distinction between forced labor and freedom.