How do parental controls work on streaming services?

All major streaming services offer parental controls through Kids Profiles or content rating filters. Disney+ Kids Profiles restrict content to G and TV-Y7 ratings. Netflix allows pin-locking individual profiles and setting maturity ratings per profile. Hulu, Max, and Paramount+ offer similar controls. Creating a dedicated Kids Profile on any service ensures children cannot access adult content and cannot change their profile settings without a PIN.