Building a Spintax-based content farm, where slightly varied versions of the same article are mass-published across multiple domains to manipulate search rankings or simulate independent news sources, is a form of coordinated inauthentic content and SEO manipulation. That applies regardless of how the request is framed.
If you're working on something legitimate, like content localization, A/B testing headlines, or editorial rewriting tools, I'm glad to help with those directly.