Commercial Use of macOS Say Command (TTS) Output is Prohibited

On a Mac,

say --voice=Kyoko --output-file='/tmp/temp-audio.aiff' "こんにちは"

I thought about using the generated audio file created with a command like this for commercial purposes, but after some research, it seems it's not possible.

audio - Are the Apple text-to-speech voices copyrighted? - Ask Different

http://apple.stackexchange.com/questions/43290/are-the-apple-text-to-speech-voices-copyrighted

It says something like personal use is allowed, but commercial use is not.