Reddit would say that vote manipulation is a serious offense, and also that brigading is an offense as well.

The link above looks fine, right? It’s informative, so we can go have a look. In which case, using a 'no participation' link does no harm at all.

However, any or many people that see it may take it upon themselves to follow the link and participate there, which Reddit might seriously mind and would’ve been prevented with an NP link instead.