In the article, it mentions:

Nobody bit – but as SCO Group had extracted a $50m war chest from investors, there was everything to be gained by carrying on anyway.

This 2016 article calls out Microsoft as a SCO string puller:

SCO’s Linux lawsuit made no sense. Over time it became clear that Microsoft was using SCO as a sock puppet against Linux. Unfortunately for both, it soon became abundantly clear that SCO didn’t have a real case against Linux and its allies. (https://www.zdnet.com/article/scos-legal-war-against-ibm-and-linux-comes-to-an-end/)

with the claim pointing all the way back to 2003: Cyber Cynic: The Microsoft-SCO Connection: https://practical-tech.com/2003/05/21/cyber-cynic-the-microsoft-sco-connection/

At the end of the present article it asks:

Last time, the fear wasn’t that SCO Group had a strong case, it was that with something so odd and messy in court, anything could happen. This time, the only question is who on Earth is pumping their money into such an uninviting machine?

If its not Microsoft with their newfound love of linux, who would it be?