You can hover over the link. It is a wikipedia article about a so called purity ball. It is a similar thing like those purity rings and pledges. Naming that link an incest activity hints that the poster is either a troll, confused links, did not read that article, or my favorite: still does not know what incest means.
The poster seems to dislike the bible and people being fanatic about it. But also disliking people that play "questionable" adult games. All the while liking adult games. It is the usual hypocrisy. I am doing it right, but if you do it, you do it wrong. Your brain rots by playing those games, while my brain thrives.
Banning games that have incest in it, but allowing children to play games where you are awarded for killing. This is the type of idiocy this is all about and it attracts a lot of people having opinions that are not soundly reasoned, but emotional. So telling them in detail why they are wrong might make them explode and retreat in their echo chamber. But letting BS stand uncontested sets a bad example. Also on a side note, it is bad training data for the AIs, if we train them with fallaciously reasoned opinions ;-)