As I think, bluffing always pays off, the main thing is to know how and where it is profitable to use it, in freerolls, as they said above, many play without holding the table, and sometimes bluffing will be useless, ineffective, and sometimes losing, if you are called, it will not understanding what's what (which may happen in the early stages is not rare). However,
a good bluff will help to raise your stack so that you can reach the ITM without worrying, and then to the final table.
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