1. Identity
The fraudster needs a name, a role or an identity document that the other person will trust, genuine or forged. In the digital-doubles case, verification involved video, a selfie and an image of an ID. An attacker able to generate all three could pass the same checks as a genuine customer.
What you can do: periodically check for accounts or credit applications in your name and review your credit report. A credit application you did not make is a warning sign.
2. A controlled channel
The fraudster needs verification to happen somewhere they control: a call, message or website of their choosing. In the Telegram case, the conversation moved to a private channel. In the Texas licence case, changed contact details meant later alerts did not reach the victim.
What you can do: disconnect and call a number you found independently. Do not dismiss an alert from your bank about changed contact details as spam.
3. Pace and emotion
The fraudster needs the victim to act before they have time to think: urgency, fear, shame or hope. The analysis on this site is that, in many scams, emotion moves before money does. In an advance-fee loan scam, the initial sum can be set low enough not to feel significant.
What you can do: slow down. Give yourself time to verify the story independently. Intense urgency is a reason to pause.
4. Infrastructure and documents
The fraudster needs a request that looks legitimate. In the property-investment case, the document itself is part of the product. In the Singapore case, ordinary-looking steps combine into a request that passes scrutiny.
What you can do: check with an independent source, not only the material supplied by the other party. Before investing, ask who the registered owner is, whether the promise makes sense and where the money will go.