It makes intuitive sense to me that this would be possible, because LLMs are still mostly opaque black boxes. I expect you could drop a whole hunch of the weights without having a huge impact on quality - maybe you end up mostly ditching the parts that are derived from shitposts on Reddit but keep the bits from Arxiv for example.

(That's a massive simplification of how any of this works, but it's how I think about it at a high level.)