If you're a Youtuber, Tiktoker, tweeter, or Facebooker, the fact that someone *explicitly subscribed to your feed* does not mean that they will, in fact, see your feed.
The platforms treat your unambiguous request to receive messages from others as mere suggestions, a "signal" to be mixed into other signals in the #ContentModeration algorithm that orders your feed, mixing in items from strangers whose material you never asked to see.
10/
There's nothing wrong in principal with the idea of a system that recommends items from strangers. Indeed, that's a great way to find people to follow! But "stuff we think you'll like" is not the same category as "stuff you've asked to see."
Why do companies balk at showing you what you've asked to be shown? Sometimes it's because they're trying to be helpful. Maybe their research, or the inferences from their user surveillance, suggests that you actually prefer it that way.
11/