I am not sure why this has angered so many since other sites have more Draconian rules.

Uh, no, they do not. Daz for instance allows (unless they since changed that) offsite links to pornographic sites so long as a NSFW warning is given, Hivewire, Daz, and RDNA all allow links to external sites with and without marketplaces so long as the MP page is not linked to directly. Links to external site tutorials are also allowed-- the prohibition of linking to offsite tutorials is going to be a major killer of this forum and this site. The suggestion of giving instructions to a link is ludicrous because some freebies are hosted on dropbox and skydrive, which cannot be found via Google/Bing/etc, while others are only available through the Internet Wayback Machine.