Don't cheer that any policy be applied to technology you wouldn't want applied to your own brain.

Imagine you get Neuralink and your best friend files for the right to be forgotten. Then poof. All your memories together gone.

Why? My memory is not a marketing database at Facebook, and I don't see any obligation to pretend it is.

This right is applied per entity.

If I send it to the company A, company B doesn't execute it unless they're a subsidiary of A (or A is their data controller) and my request was carefully crafted.

In the scenario you painted, that would mean that my _former_ friend has issued their request to me.

In that case? Fair. Poof if that's their wish.

Otherwise? How do you imagine it work?