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John Barrymore, the actor who played Svengali, died on the same day that Fishtank ended, on May 29th (1942). Mariah Marsh plays the girl controlled by Svengali. Her birth name is Violet (Violetta) Ethelred Krauth. She played a girl named Josie in the 1939 film Missing Daughters. At some point in the show Jet played a 40s cop (he specifically says he's imitating a 40s cop, not a 30s or 50s one) who kept saying this was "a case you get once in every 20 years". In the film Missing Daughters, the protagonist is a detective who is trying to find out what happened to Josie. Eventually he discovers that she fell victim to a prostitution/slavery ring after trying to become a famous girl by working as a hostess at a nightclub. In one scene, the detective also says this was "a case you get once in every 20 years".
The entirety of the show was crafted by Sam and Jet with both Letty and Josie as the final contestants from the start, and with the grooming narrative as its natural conclusion. You could think from this that the grooming is just a bit, and that the appearance that they're being groomed now is intentional to sell it to the viewer who is still watching and wants to see what happens to the girls. But NO! Getting people to act into bits is how you get them to act the way you want them to act. If you tell someone to act in a degrading and humiliating way for a bit, they've still been degraded and humiliated. So telling Letty and Josie that the appearance that they're being groomed is for a bit, the final bit of the show, is actually a way to groom them further without having them resist it, since they're in on the joke.
Everything that happened so far with how their "streaming careers" have been handled so poorly points to this being true. It's the only way Josie could accept not making money for this long without protesting or realizing anything is wrong. It was already over before the show even began. There's nothing you can do about it other than watch.