By driving sign ups and retaining subscribers. The same way Netflix makes money. This topic has been discussed here before. There was a leak of Amazon information back in 2018 that gives a small glimpse of how they consider these things.
https://www.reuters.com/article/us-a...-idUSKCN1GR0FX
The documents also show that Amazon’s U.S. audience for all video programming on Prime, including films and TV shows it licenses from other companies, was about 26 million customers. Amazon has never released figures for its total audience.
I'm highlighting this part from the article because it mentions that Amazon believed their audience for all Prime Video was about 26 million customers. This was back in 2018 and the service has grown significantly since then. It really indicates how the viewership of Reacher, The Boys, and The Rings of Power is such a big deal to the service and gave Amazon a "Win".
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To be fair what Tolkien wrote still allows for the eternal souls to not be an issue. As the Elven-Orcs can simply be a different breed. Tolkien did have Half-Orcs and Goblin-men. Not all were created by Saurman as I saw something imply that Half-Orcs existed prior to the Dunlendings going to Saruman but can't find a specific quote from the books to back that up. The First Elves could simply have their eternal souls locked away in the Halls of Mandos. Being cast into the Void or "weakening" like Sauron after his final defeat are also possible fates.
Is it something left unexplained? Certainly but even with out a re-write there are ways it can work.
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Doesn't making an Orc more like an elf give it a better light by default? I think this is just a case of you not understanding something or being to lost in the argument to see it.