It's no mandatory, that every bank has to implement, it's just RBI increased the cap/limit by ₹2, making it ₹23 (21+2), hence most of bank are going to revise for the maximum permissible limit, ₹23, obviously for maximizing profit. The way most of the retailer sells at MRP printed/announced by the producer/ manufacturer.
Exception; IDFC and few others others.
Some bank has waived off for some special segment/ variant of account/card.