As i have mentioned in my other comments here;
The communique from the mathematicians when shorn of polite language is blunt viz.
AI companies are stealing our hard-won lifelong research findings, which we were already sharing freely, without attribution/credit and building upon them without informed consent nor compensation.
It should now be clear that the AI companies behaviour i.e. backstabbing the mathematicians and stealing their life's work is the problem and not the usage of AI itself.
I also pointed you to Self-Determination Theory(SDT) to understand Intrinsic/Extrinsic Motivations that drives Mathematicians (and also Scientists/Researchers/Knowledge-workers) to spend their entire lives in the pursuit of knowledge. From SDT it can be seen that the AI companies behaviour, threatens everybody's Autonomy, nullifies their Mastery/Competence and robs them of Purpose/Relatedness/Belongingness. Nobody should accept this.