Piracy isn’t stealing regardless.

Stealing is to deprive someone of something they posses.

It’s not possible to possess something that doesn’t exist yet. Your copy doesn’t exist until you make it (by downloading the file).

If you chose to not support creators by paying to copy thier work, that’s maybe unethical but it’s not stealing.

If you hack into a Sony server and copy an unreleased film, then delete their copy, that is maybe stealing. Anything short of that is just copying.