Is my work editing a wholesome educational video for a YouTube channel, whose owner profits from advertisements that include unlawful content, considered aiding in sin, or is my wage for direct work unrelated to the channel owner's method of earning?

It is not forbidden to edit videos with permissible content for those who publish them on YouTube. The possibility of forbidden advertisements appearing does not affect the permissibility of the work or earning, as editing videos does not constitute direct or intentional assistance to forbidden advertisements.