Hmm, so my interpretation of steemexclusive is that it is, as the name suggests, exclusive.
As soon as I publish an identical post elsewhere, it is no longer exclusive, whether before or after, it doesn't matter.
Ultimately, it is my free decision whether I use the tag or not.
And, of course, content from free sources may also be included, provided that it is marked as such.
Regarding AI content: as far as I have been able to ascertain, it has no owner, simply because machines cannot own property. Copyright does not exist for machines.
AI content can therefore be used freely by anyone. This is usually the case, but the operators of the AI software may have regulated it differently, so you cannot always rely on general rules. That is what I have been able to find out.
Here you talk about humans using AI content freely but AI takes the content of humans first ...and indeed for machines copyright doesn't exist but that doesn't mean for its owners (those who created AI). I am sure they won't like it if anyone steals their idea.
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