People taking your work and not giving anything back was ALWAYS the risk you took when writing free software. LLM training doesn't change that much. That the us military no doubt is using gcc to compile embedded software for their icbm:s no doubt irks the gnu people. But you can't have it any other way. "You can only use my software for good things" just is not consistent with "free software".
There's an almost intergalactic level of irony in the extent to which open source has benefited giant corporations and the military at the expense of individuals, and ultimately contributed to the commercialised enclosure of software IP.
I suppose you could argue it also indirectly led to the empowerment of non-developers to create their own vibe coded solutions. But we're not quite there yet.
And the AI IP that makes that possible is still enclosed rather than open.