Im not sure I agree with that statement.

It’s like saying using a computer means that any program on it belongs to the makers of the operating system because you need that to run it. Or every Java program was made by oracle because you need the JVM to run it.

VS Code is its own software (and service nowadays), and yes it builds on chromium in part. But doesn’t make the idea, the actual application, i. e. what’s on top of chromium or other associated service owned by someone else.

I do agree that many software devs and companies rely on Chromium and thus Google, often too much, and I don’t think that’s a good idea But they definitely retain ownership of the code and associated functionality on top.