Well, I hope your viewpoint doesn't win the day, because making code as freely shareable and remixable as possible is a huge boon for humanity.
Or something else ?
Or they should do opt in.
<ducks>
IMO, the only way to use Copilot's output in an ethically sound way is to only use the output it produces in AGPL licensed projects (assuming that Copilot has not been trained on any non-free software codebases which in itself is a strong assumption).
Even then, that is missing attribution which should really be the default for all code reuse and derivation even when you legally are allowed to omit it.
Also without attribution. The more permissive licenses allow corporations to profit from shared code, but most of them still require attribution.
And it's really not much to ask: when someone gives you free code, give them credit for their work.