Because you're moving the "exit" from your non-anonymous local ISP to your non-anonymous colo provider. If you want to hide your traffic or at least make your adversary work a little to determine who you are, shared VPN endpoints are better.
How is that any different? ISPs don't let just anybody know who the subscriber is at a given IP (though if you do reverse lookups, many ISPs so leak a lot of locality information, so still a good idea to use some VPN instead of no VPN).
My Streisand hosted on AWS looks to the outside like anybody else's Streisand hosted on AWS, doesn't it?
Similarly, my f-secure egress looks like anybody else's f-secure egress, so what's the difference?
I don't really know, I don't use a VPN. Really asking.
And reputable VPN vendors resist efforts by nation states to procure information about subscribers? I would expect to have to pay a handsome fee for that.
(I'm not saying you're wrong; again I've not really thought about having to thoroughly anonymize my own traffic.)
