He has probably been given a command to never take it off
if you think about it, this sub and dom universe is relevant to the omegaverse. maybe a collar is as equivalent as a bite on the nape methinks
It is suppose to represent a doms property but I don’t think it’s as extreme as a bite on the nape
Maybe similar 'warding off others' effects
But wasn’t it put on him as a joke, I don’t know maybe later they will show why.
Can’t he cut the collar or is he just going to keep it on to make sure other dom don’t come near him, because having a collar means he already has a dom.