Many real scams are not this obvious, plus a lot of old people are senile to some degree, which these scammers are exploiting. My grandma was contacted by "her bank" about verifying her identity, and after a few minutes of establishing a backstory they asked her for her debit card info including CVV. It all sounded very legit, and they even "transferred her to another department" with hold music and everything. Luckily, she didn't fall for it.