iCloud Relay is not Apple’s VPN, if that’s what you’re thinking.
You’ve said similar things multiple times. But that’s not all VPNs do. They also hide your activity from your ISP. And companies don’t already know everything about you. There is still a lot more to learn. Also, they may have info on your past activities and whatnot, but not future activities data (which you can always still safeguard, it’s never too late).
Again, that’s not the only advantage of a VPN.
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I recommend reading up more on VPNs and what they do and don’t and why you may still want to use it. If not Obscura, something else perhaps that works for you. PG has enough resources including a fantastic video.