Trapping itself is an exploit.
In the past you could trap mobs and kill/sweat them, what has been done with Spiders and many other mobs, too.
MA introduced the "Trapped Status", for mobs that can´t move or can´t get into attack range.
Not getting into attack range, results in trapped mob status sometimes when walking backwards while shooting (imho bad solution, but it is that way so we need to adapt to it)
Actually its impossible to exploit "Trapping", the way it was done in the past.
Group sweating is not an exploit, same counts for group hunting.