There were some college FB protests last season. Michigan, Michigan State, and Nebraska players disrespected the anthem for sure.
No doubt there were others, and probably also this year, but they don’t seem to be getting much publicity.
Those with NFL ability wi protest by going on strike during the bowl games to avoid injury.
Nebraska did have some players on their knees when they played at Illinois, but for home games, the national anthem is played before the players take the field.