I think when they just said ‘Yes, LLMs can steal your work’. That showed they don’t even care about property rights, which is the one thing the right have always pretended was their raison d’être.

Even if you use open source software exclusively, the hardware you run it on was still manufactured under capitalism, the hardware it was built on was manufactured under capitalism, the electricity you’re powering your hardware with was provided by capitalism, and the very economic system that allowed the devs to build and maintain the software… was capitalism.

None of this is in capitalism’s favour. That there’s no getting away from it is, for Marxists, a key argument against it.

I’m not a communist myself, but the last point is so fatuous that I think it’s fair to conclude that anyone actually making it is not arguing in good faith.

The first two, though, are completely valid arguments and you should respond to them by ceasing to describe yourself as a communist!