I just got randomly subscribed to another YT channel without my knowledge, this has happened several times in the past, I know that more people have seen this, but does anyone know the reason?

I am seriously starting to question if YT have started selling packages where you can buy subscribers to your channel...

A few weeks ago I noted that I had been subscribed to three smaller channels of generic corporate slop videos, I unsubscribed naturally.

Today I was watching a video on my phone I suddenly noticed that as I was closing the video a pop up saying that I had subscribed to the channel, I was very confused as I was already subscribed to the channel I was watching, Hidden In Sweden (btw, the last video was very interesting), and I checked my subscriptions...

I had been subscribed to a random holiday home rental company in Spain's channel....

Are there ads that immediately subscribe you to a channel? What is going on?