Regardless of their agenda, they only know it themselves, and it's not new in the forum as sometimes I can see some politics playing around the forum, we are unique individual and we have different intention sometimes but what matters is the evidence of the scam and the reputation of the site.
All scam accusations are coming from newbie accounts, so they have no integrity unless they provide a solid evidence to support their accusation, and this accounts can be a throw away accounts.
That's why it's important that we should not react directly everytime we see a scam accusation thread, regardless of the reputation of the gambling site, we should all based on the evidence so we cannot be bias on our own.
Personally I can say that sportsbet is a good site based on my experience but it could be a different case for others, but then as long as there's no valid accusation, site still keep their good repuation.