I think you'll need to slowly make peace with the fact that people don't want their work stolen by AIs.

You don't need to make peace with it. You have no obligation to accept a greater risk of malware than before. If anything, you should be more cautious because AI helps attackers.

(We don't actually know if this has anything to do with AI training.)

Ironic, considering that this whole project is built upon stealing the design of Windows 7

Don't think it's really accurate to describe restoring an old theme to an OS as "stealing". It would be stealing if they made their own OS using the Win7 theme.