If millions of people keeps generating addresses on BTC wallet for example can this get faulty some day? Like generating someone else wallet and having access to their wallet? I've take a look at many recovery seeds and the words sometimes look alike, I'm just curious .
From my limited knowledge, generating seed phrase was designed to be truly random. Some words could be the same but it's extremely unlikely that all words generated from each wallet (12 or 24 seed phrase format)
will be in exactly the same order.
Since you're using a bitcoin wallet as an example, I think your topic is better suited for the technical discussion board. You'll get better answers there.