Why do beadlock rims require constant verification of the bolt torque??

Is it cuz the bolts actually loosen up??

Or is it cuz the bead rubber takes a set under pressure and "relaxes" the force it places on the rings??

TIA

After about 4 months every time I check mine they are still holding their torque settings. I guess the rubber will deform to a point along with the ring conforming to a point, mine must have reached that point :D