I apologize, my friend, but I am not entirely sure what you mean by the term "fiat miner". If you are referring to mining fiat currency, such as USD, that is not possible as fiat currency is not a cryptocurrency and does not rely on mining for its creation. Fiat currency is instead typically issued by central banks and regulated by governments.
However, if you are referring to the process of converting fiat currency into cryptocurrency through a fiat-to-crypto exchange, then that is something that many Bitcoin enthusiasts and investors do as a means of acquiring cryptocurrency for their portfolio. This process typically involves purchasing Bitcoin or another cryptocurrency using a traditional currency, such as USD or EUR, through an exchange platform.
Of course, as with any investment, it is important to weigh the risks and potential benefits of converting fiat currency into cryptocurrency, and to make informed decisions based on your own financial situation and goals.