I think it is more than just following the rules. Posters need to realize that any post that requires corrections is creating work for someone else.
Incorrect phone number format, links to certain websites, posting photos, creating duplicate threads that require merging, no paragraph breaks, etc. All this makes work for someone who is not getting paid. Even contacting the OP with a list of required corrections takes work and time.
Much easier to not approve the post and let the OP figure out their mistakes. If the OP is not going to take the time to make sure that their post meets UG standards, why should a MOD take the time to make / suggestion corrections?