1

I recently came across a link to a YouTube video with

?sub_confirmation=1

appended to the link.

What does this do?

2

What this does is automatically subscribe the follower of the link to the YouTube channel that posted the video.

It's not totally silent as it will popup a confirmation dialog:

enter image description here

so the user can choose what to do.

It's not a very nice thing to do though.

Source

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