Entertainment value is value, my dog has value to me but is nothing but a monetary cost. It is in how I enjoy having my dog so much that I will pay the monetary cost because he is that valuable to me.
Someone downloading and using an app isn't indicative to that app having much value to the end user.
Of those 800 million, how many are paying? That number could be easily over-represented by people doing things without real value to them. I also don't know how many of those users need professional help whether it be severe social anxiety or the people who find intimacy in a chatbot.
Like, you're right there has to be some value to it but I just can't see trillions of USD in value.
The english-using internet is predominantly American men so it's a sampling bias unless you were to switch languages.
It's pretty ironic we're talking about being confidently incorrect, with confidence, and based on anecdote with no research.
It's just natural, ignore how many things we do as a species that aren't natural, the suffering must be protected.