Craze is due to 3 reasons.
1 - All the codes you see above are from internal data. Branch employees won't tell you which debit card to apply for because they probably don't know about these codes.
So, TF is the only source for the codes.
2 - Although the majority of benefits are the same across all account variants, it still feels great to have a dedicated RSDC tailored to your account variant and segment. As you can already see, there are more than 15 codes for different accounts.
3 - Lastly, the majority of state and central government employees (like myself) prefer an SBI salary account for peace of mind. Internet banking is self-sufficient, so there is rarely a need to visit a branch, unless cash deposit or meeting BM for your personal work.
Loan and other service charges are also lower, and RSDCs are free for us, so why not opt for it? Plus, we have been waiting for the RSDCs for quite some time.
They weren't available before. Hence, the craze.