My assumption is it's bot action. Bot just wanted specific numbers transaction and it has seen the stop loss or sell trigger. It has done the work without even looking at the fees.
If it's done by humans then it's definitely like ignorance or newbie action. But chances are this is some corporate bot ran through the scripts.
I just can not imagine any bot could ever do this.
I think it is all about missuses of UTXO, and misunderstanding how Bitcoin transactions work by design.
Trust wallet is charging you 1-2 dollar on the top of the ethereum fees. It can definitely be done. Once we are done by bank and govt the private companies too are greedy and they want bigger cut too. Bots can be designed to cut such fees. I am just not sure why this stunt was done though.
It is all about understanding what UTXO is, and how it works