Descript alternative for voice cloning a video game character?

Just been learning Descript and spent hours cutting up video game footage to get 10 minutes of a character talking to test out voice cloning to make the character say different things.

When I submit training data, there's a disclaimer about only using your own voice. I didn't realise this but I understand it makes sense.

My question is, are there any other alternatives? For example, how are these AI songs getting put out there?

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