i don't know if it originated in the AUDL/UFA, but a lot of teams there do the side-line trap pull hoping to put on a lot of pressure and get a first throw turnover. i assume it's something machine is experimenting with.
And you don’t want to put it too far back because you want time to set it up, and don’t want a huck to be an easy out (at that range a huck would go too far)