Plugins that are not distributed as part of calibre are not vetted, tested or guarenteed to work. Hence the warning message when adding 3rd party plugins. If they're not a part of calibre they're 3rd party.
You are as safe with plugins from respected and long term members of this community, like Kiwidude, as you are with plugins that come as part of caibre.
What it really comes down to is the source (not code) of the plugin. Is it some randome site on the internet or a MobileRead member with thousands of posts and tens of thousands of karma points? Ask yourself do I trust giving the plugin and by extension the person who wrote it to run it on my computer?
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