It was previously announced tha the official Toei Tokusatsu Official YouTube channel exceeded one million subscribers.
During the YouTube Fan Festival Japan, Kamen Rider ZI-O and Zero-One participated in the event. They received the award on behalf of Toei.
The related scene takes place from around 10:30~11:20.
To honor the award, the Toei YouTube channel is airing the entire Kamen Rider Fourze series.
Article Sources Toei