The answer is in the article.
Hypothesis:
> Little is known about whether the victims of MMF are more kind compared with nonvictims; however, given that many of the romance scam narratives involve a victim helping out another it is hypothesized that individuals who score high on a survey measuring kindness are more likely to be victims of romance scams (H9) compared with those who have not become victims of romance scams.
Method of measurement:
> Participants were asked to complete a series of demographic questions (e.g., age, gender, education, knowledge about cybersecurity), personality items (e.g., impulsivity, locus of control, trust in others, trustworthiness, kindness, greed, addiction disposition), and whether they had been scammed by MMF. They were also asked specially whether they had been scammed by the romance scam.
Interpretation of findings:
> The finding that less kind individuals were more likely to be scammed by romance scams was less easy to explain. Perhaps, less kind individuals have fewer networks to help them check profiles or perhaps they seek out more harmful relationships. Kindness might also be a more transitory disposition. At the time of the scam, researchers have found that criminals isolate the victim from loved ones and push them to focus their time and resources on the fictitious relationship. They have also found that it is difficult for victims to rebuild their social networks after the scam has taken place. This might explain why victims of romance scams are less likely to rate highly items such as: “going out of their way to cheer up people who appear down,” “helping out a neighbor in the last month,” “getting excited by others good fortunes,” or “calling their friends when they are ill.”