I've already had this technique in mind.
Let's say John claims to have lost Bitcoin, alleging he was scammed. Then, this John uses another Quora account, offering recovery services and providing a contact name. Typically, fake reviews are added by John to boost the reputation of his posts offering BTC recovery services. Actually, no one really loses Bitcoin, and there's no genuine service for this. John just aims to gather sensitive data from his victims by manipulating the reviews given to himself.
It's an old strategy, and I've been suspicious from the start. For those unfamiliar with this tactic, be cautious when seeking help from strangers. The online world isn't just filled with good people... there are still many with malicious intent who want to seize assets by any means.