It's not so different from the fundamental fear of Alexa/Assistant/microphones that's fairly well diffused now.
Except the Furby actively claimed to learn how to speak based on your speech, and had a built-in feedback loop to make it appear as such.
In retrospect it looks like it more was "shift mix towards English based on how much you've heard" than "add words you heard to your speech patterns"
[^1]: https://www.listenandlearn.org/blog/no-you-cant-teach-your-f...