> A former employee of theirs told me that at one stage they were replacing ad content with their own adverts This was afaik the main reason, why YouTube went

> A former employee of theirs told me that at one stage they were replacing ad content with their own adverts This was afaik the main reason, why YouTube went HTTPS-only very early compared to the rest of the internet. Some ISPs exchanged the video ads of YouTube with their own and lowered the resolution of videos to save bandwidth. YouTube's customers were very dissatisfied because it constantly broke and the video quality was very bad and thus HTTPS came to the rescue.