The concept of the Standard type DC plan is that the pension service provider prepares different styles of pension plan rules and let companies to choose whatever they want. Then, there can be multiple companies who choose the same standard pension plan rules. So this plan is called a DC plan with multiple sponsors.
If companies join the pre-designed standard pension plan rules,
If more than two company signup for a standard DC plan, each company does not need to file the penson plan rules and pays lower fee thanks to increase in asset size.
It saves you cost.