In an interview last year Q and DL gave Neto props for being a "creative player" .... and said we need more of that on the roster. Neto's value to the team may be in practice, primarily.
The ACB site confirms this as well. 1.84 m, which is just over 6' w/out shoes.6'0.5'' without shoes, 6'2'' in shoes at the Eurocamp in 2013(he was 20 then):
https://www.draftexpress.com/profile/Raul-Neto-5958/
He just doesn't want to play in the NBA. The Jazz surely would rather have some draft picks from NYC or Los Angeles than just to let this guy never come over.
If he doesn't want to play in the NBA, why would any team trade for him?