[0] https://mobile.twitter.com/socialblade/status/10523754246160...
[0] https://mobile.twitter.com/socialblade/status/10523754246160...
YouTube did this a while back with other demographics. For instance, CaptainSparklez often mentions this as one of the reasons why he became big; i.e. YouTube was autosubscribing folks to certain creators.
EDIT: If I recall correctly, when you create a new YouTube account, they give you a list of channel suggestions that you can check off to bootstrap you into suggestions based on your preferences, so this could be that, meaning people just "select all".
Here's one that auto-subscribes to Pewdiepie: https://www.reddit.com/r/PewdiepieSubmissions/comments/a0wcd...
Source code: https://github.com/Alone2/SubscribeToPewdsScript/blob/master...
1. https://twitter.com/sergevanred/status/1052381733172244480/