Relying on phone numbers
Much as I agree with the 24E6 eggs comments, the central point of the article is the reliance on phone numbers.
Increasingly, financial bodies (including HMRC) insist that you give them your (mobile) phone number "for security" --- exactly so that they can send you "codes" to do exactly this.
At least twice banks have refused my business because I wouldn't give them my phone number(s), even though I had provided plenty of evidence of solvency.
So, power to Seth Shapiro and Michael Terpin. I hope they win their cases against AT&T and that banks take notice!