Might be just me, but Im not sure I would feel comfortable wiping the special sauce off my chin wearing a hungry jacks t-shirt into mcdonalds on free big mac day.
Im not expert, but my understanding is:
Sites like CC are able to operate and provide this (free) service through some advertising
Advertising revenue is determined (at least in part) by site traffic
Posting a link to a forum alternative potential takes some traffic away from this site, potentially reducing their revenue.
Probably no big deal - thought I would just mention it. Im prone to over-reaction and being self-indulgent.
Cheers