From what I’ve seen on https://0123moviesz.to/, broken links are usually replaced rather than removed entirely. This approach keeps pages populated with alternatives, even if some mirrors stop working. While it requires users to test a few options, it also means content rarely disappears completely.
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I’ve noticed the same pattern. When one mirror goes down, another often appears in its place after some time. It’s not always immediate, but checking back later usually helps. This system can be a bit inconvenient at first, yet it does reduce the chances of a title becoming completely unavailable.