Like you mentioned, this is not new at all, but I am still not understanding how people are so quick to keep conversations on with strangers to the extent of trusting them in financial dealings. I can hardly agree to maintain further communication with someone who mistook my number for someone else's, not to mention of trusting them with and financial dealings.
Maybe their prime targets are older people who suffer from loneliness and appreciates any form of attention given to them and as we all know, most of them trusts easily since their mental configuration and perception level has degraded with age.
It could be possible since old people are actually prone to scams.
However, my own take about these victims is that they are looking for get rich quick investments, and this scam scenario is just making a perfect entry. And we can see that these victims are probably not business mindset people so they trust strangers easily even when it comes to financial transactions.
I know this kind of strategy is not something new, but for ignorant and innocent people, this is new for them, no wonder they bite the offer easily.