Curling

I'm familiar with club level curling where teams aren't necessarily crafted to maximize wins, which is clearly the case at the highest level of play.

My question is how these team decisions are made and who has final say.

Other team sports usually have some organization behind them with ownership and management and coaches that make decisions on the roster, sponsors, training/practice etc. Does this all fall to the skip to delegate or is it more like a democracy? Maybe each team handles decisions differently?

I was just musing on the Ship of Theseus while watching the World Women's and it got me thinking about replacing each player one at a time until the entire team is different, at what point it becomes a new team.