Could this be considered a "seed-stage film fund?"
In some sense $200k is actually quite a lot for a no-name script, but since Amazon gets all the equity I don't think we can call it a seed fund. This may be how the movie industry works (all the upside for a new writer is in reputation), but since you don't get to make the movie and earn the profit it doesn't seem comparable.
As you say, $200k for a no-name script is actually not bad. And if it has some decent success (gets made into a movie at all), that byline probably has some value.