Why does the Coinbase trial fee appear in the buy order?
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Coinbase's free trial eliminates the selling fees, not the buying fees. Market circumstances and order size are two examples of the variables that affect these costs.
Even during the trial period, instant buy orders frequently came with a minor fee or price markup, and most certainly profited from this bonus. When the trial period is over, regular instant buys would not be eligible for its benefits.
Reimbursement of this fee is unlikely. Market conditions and order size are 2 variables that impact these costs.