Uh... Asking ChatGPT kinda changed my mind.
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The website ipsw.me is generally considered safe to use because it doesn't host files directly; instead, it provides links to Apple's servers, where official iOS firmware files (IPSWs) are stored. Since the files come directly from Apple, they are legitimate and not tampered with, and they require Apple's verification (or "signing") to install on devices. This ensures that the downloaded files are authentic and safe to use.
However, some users have reported confusion about non-SSL links, but these are still pointing to Apple's official servers, which makes them safe (MacRumors Forums) (Apple Support Community).
Just ensure that the version you are downloading is still signed by Apple, as unsigned versions cannot be installed (MacRumors Forums).
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So is that a yay or nay?