I run a STEM page on LinkedIn & X. I have to post something STEM-related daily on them for which I search Google News for an article, open it, copy its content, and then ask ChatGPT to write an engaging LinkedIn post or Tweet for me out of it.
This just sounds like blogspam to me. Why not just share the link and let it speak for itself, if you're not actually putting any original thought into what you're saying about it?
But going back to the question in your post, I suspect the reason you aren't getting paying customers is that people/companies who are reposting content across social media already have established patterns to do it and there's not a value add of switching that to your service.