Channel Advertising Content Not Suitable For Children

Roku's continued advertising of Horror channels and Crime channels, located within the channel guide, between programming is offensive!  Children watching a suitable program, on suitable for children, are EXPOSED TO OFFENSIVE/SENSITIVE CONTENT when channel advertising occurs.  Additionally, it is continuous exposure to these Horror and Crime channels of cut off heads and murdered bodies.  There is no option to turn off and no warning when the OFFENSIVE/SENSITIVE content advertising will occur.  What agency can be contacted to address ROKU'S advertisting of these Horror and Crime channels content?  ROKU MUST CONSIDER THE ENTIRE VIEWING POPULATION.  Most parents to not want their children to see HORROR AND VIOLENT CRIME IN ADVERTISING.  MUST BE VIEWERS CHOICE.