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Text-to-speech options?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
That's pretty standard. Most FOSS projects don't have corporations feeding them 100's of thousands of dollars. Even when they do, well people still say gimp is far worse than ps. Blender is one of the rare complex projects that can compete with proprietary alternatives.
My best guess is that it's really expensive and time consuming. I'd be surprised if those really good proprietary models didn't cost $100k+ just for training.