Uhhh.... as one of the people who is an age regressor, if my parental wasnt abusive I would call him daddy. Just because a group of people are in consenting power exchange relationships doesnt mean they're sexualizing children. Kids can still call their parents mommy and daddy. But, ever think maybe the parents dont want to be called those terms for personal reasons? Not meaning to come off as rude, but I deep dived into the BDSM umbrella.
Then again, there are child predators that would probably force their victims to call them mommy or daddy. That's what sickens and saddens me.