[soneil]

For 1), it seems clear that there's a heavy overlap between Jeff's market and Elecrow's, and it's difficult to see that as a coincidence.

If someone cloned both Shaq's voice and Jeff's, and used them to endorse sneakers - I think it's a fair assumption that Shaq would see this as a business risk, and Jeff .. I'm going to go out on a limb, and assume he'd probably find it hilarious. Using Jeff's voice for sneakers would be more akin to your example of finding a midwestern voice with a useful corpus. Using Shaq's would be a much more obviously targeted appropriation.

What we're looking at here appears to be exactly this scenario, except this is Jeff's niche, not Shaq's. Using Shaq's voice for SBCs and related products would feel quite absurd - using Jeff's feels like a much more obviously targeted appropriation.