Penalties can be several times actual damages, and substantial similarity includes MP3 files and other lossy forms of compression which don’t directly look like the originals.

The entire point of deep learning is to copy aspects from training materials, which is why it’s unsurprising when you can reproduce substantial material from a copyrighted work given the right prompts. Proving damages for individual works in court is more expensive than the payout but that’s what class action lawsuits are for.