On the internet, I think Spam is worst than scam as moderators can detect spam themselves yet scam requires both parties to defend themselves.
I don't think so, they are equally bad, or scam is even worse because someone losses their funds, just that on the forum scam isn't moderated, and it isn't because spam is a worse evil, just that it is easier for the forum to moderate than scams, which they leave to the responsibility of users.
Spam has to do with the platform and scam affects users on the platform. Spamming is a way of scamming an internet company or platform like the forum, or any other social media like Fb or Instagram. Black hat users create multiple accounts and spam such platforms to make money out of the platform through account sells or boosting a specific account for malicious purposes. That's why spam is equally frowned at by moderators like scam. Though Scam is bad because a single person bears the pain, but spam deals with the success of any internet establishment that's why I said, it's a tough attack on the internet. Between, spamming can also lead to scam. Take Spotify for instance people spam with fake streams to earn huge amount of money, it affects the company at large. Hence they are both the same thing, just that platforms focus more in securing their sites, that's why they follow up spammers aggressively than they do to scammers unless a person relays a solid report to the moderators.