I mean, "theft" implies depriving someone of something, to me. But I don't want to bicker about definitions if your position is more about morality of taking something for free than about the definition of theft.
For myself, I'll happily pay for things that provide fair value and a fair agreement / relationship. That includes donating to stuff that is offered for free - there are a handful of content creators and other services (Internet Archive, Signal, etc.) that I directly support, every month. And by the same token, I don't feel bad at all about enjoying something, for free and against their wishes, from a company or publisher that only offers unacceptable (to me) terms.
To me those are perfectly consistent. My dollars go to individuals and publishers that produce the kind of media ecosystem I think is good for us. Because - we must be clear - it's not a level playing field, and the shift away from consumer ownership is a plague of exploitation inflicted upon us. It's now metastasizing away from strictly digital domains, now to physical hardware, which is outrageous. Roku, for instance, can update your streaming device overnight and force you to accept their new terms, in order to keep using your device. This is not hypothetical, it happened (may have gotten company wrong).
Do you think the companies enacting policies, particularly ones prohibiting ownership outright, are operating from an ethical or moral framework? I promise they don't believe in anything like that. They screw us precisely as hard as the courts, and the court of public opinion, allow. And they're always trying to move that line in their favor.
Why do you care about pirating? Who or what are you standing up for, I guess I'm asking?