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I checked with one online site that does AI based text to speech. When you send them text, it is checked to see if it is copyrighted text. If so, you will get the treatment that the OP complained about. If it's not copyrighted, you can get up to a couple of minutes of speech with their free service.
The site was not forthcoming as to which service(s) they use to check for copyrighted text or much of any other interesting information.
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