IMHO they are different.
A simple scam might occur once but if it grows into a pattern - to me this can be fraud.
The scam…might be the a seemingly innocent request for aid or assistance… but as a scam will be done over and over again once successful in obtaining the rewards …until forums like this call it to people’s attention. It is fraud once a repetitive pattern is established.
Cuba attracts veteran and newbie travellers. The “Scam / flim-flan” type of behaviour is valuable information for travellers. It is good for the newbie/unseasoned traveller & also for Cuba and Cubans…If more people are aware of the few who are doing this type of behaviour and what it looks like they will not buy in…they will refrain from doing more and tell other travellers