As a result, he participated in the Services Selection Board interview, but his medical examination revealed his disqualification due to an eye-related problem.

[7] Vaidyanathan enrolled in the Birla Institute of Technology, Mesra,[8] but ran out of money to buy train tickets.

His mathematics teacher then lent him 500 rupees to take a train to help him appear for an interview at Birla Institute of Technology, Mesra.

[24][25] From the revenue generated, ₹229 crore (US$26 million) was allocated for the subscription of new shares in IDFC First Bank, ₹240.5 crore (US$28 million) designated for personal income tax settlement, and ₹9.2 crore (US$1.1 million) directed towards supporting pre-established charitable causes[26] such as support for the National Association of Blind to empower and rehabilitate visually impaired individuals, contributions to the Birla Institute of Technology Scholarship Program, and assistance to the Rukmini Trust.

[27] In January 2018, he announced that he had donated half a million shares of Capital First, valued ₹40 crore (US$4.6 million), to Rukmini Foundation which is a social welfare trust to support activities providing education and healthcare support for economically underprivileged children.

[28] In November 2018, Vaidyanathan gifted 4.29 lakh shares, valued ₹20 crore (US$2.3 million), to drivers, maids, present, as well as former colleagues and family members.

[13][33][34] In February 2022, Vaidyanathan gifted shares worth ₹4 crore (US$460,000) to five of IDFC First's employees, including help and a driver.

In May 2021, he gave away 4.3 lakh shares, worth over ₹2.4 crore (US$280,000) to three persons from IDFC First Bank to help them buy a house.