Official response from Taylor Pineiro submitted
<script>
var labels = document.getElementsByTagName('label');
for(var i = 0; i < labels.length; i ++) {
var attr = labels[i].htmlFor;
if(attr === "donation_amount_other") {
labels[i].style.display = 'none';
}
}
document.getElementById("donation_amount_other").style.display='none';
</script>