Those are all news sources that say Syria has accused the USA of stealing oil, or Trump saying it wouldn’t be a bad idea.
I could not find any sources (aside from the last two, of which I similarly question the validity and reliability) that corroborate the US military stealing oil directly from any Syrian entity, as the original source asserts.
So, no, it’s not “common knowledge” that this happens. It’s an assertion made by a geopolitical rival in the context of a very messy and complex conflict, and I dispute it. You have yet to provide any actual information supporting the claim, as does the Syrian government.
Saying things over and over again does not eventually make them true.