That's what you think and may be correct.... but its marketing gimmik from HDFC. They call Conditional LTF (where condition is the asterisk).. they highlight LTF but keep the (*) which people don't understand xD
Bank has the authority to change any card from LTF to paid if they think the customer is not worth owning their card as LTF...
It has happened with many people (some of which are here on forum too with their threads). I remember 1 guy had created a topic in HDFC CC area where he was called and told that they are converting his LTF DCB to paid as he isn't using the card as much... try to find it
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Many people have this mindset but you should always remember, they are giving you their product/service to use... they have complete authority to change your card status and to cancel it at their will if they don't think you are worthy enough... Always keep this in mind.... You don't own that, They approve you for using their service, whose terms and conditions can change anytime.