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If the jquery version changed, their site could break anyway due to changes in how the library worked.

Could, yes. But in practice this happens very rarely. Breaking the site because a new version is released with an old hash will happen.

Very rarely being every single release? You should not be using a changing library in any production code, you're just asking for problems.

If all you're using jQuery for is a document.querySelectorAll polyfill + the most primitive event handling, you're possibly safe, as those don't change terribly often...but at that point, you should probably be using a different library or a custom build of jQuery.

Unfortunately, it's the people least qualified to assess the safety of using an always-changing version who are most likely to do so.

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