In the video clip, the intended meaning is that Not all money is the same or Not all money is equal, as the following sentences indicate. He would prefer to have the investment of Bill Gurley over crowdfunding because Bill Gurley's involvement makes his investment more valuable, perhaps even twice as much.
This also seems to be the meaning behind the forum usage, where the initial question is asking why there are different sources of funding and who decides how to divide that funding up. One later reply observes
… remember that money isn't money isn't money — Congress appropriates funds for various purposes with various restrictions, and the restrictions only increase as the money flows downhill. This is how we get disconnects, e.g., plenty of money for new printers (equipment), but no money for printer ink (consumables).
That is, just because $1 million is available from one budget and $1 million is available from a different budget does not mean that the money is interchangeable; they are earmarked for different purposes, have different spending restrictions, and so on.
This isn't a set phrase, and I wouldn't consider it a snowclone, nor do I think it is related directly to a rose is a rose is a rose, nor is it an example of antanaclasis here. I suggest it is simply a repetition for rhetorical effect of definition by redefinition, which is not uncommon:
Love is not love / Which alters when it alteration finds,
Don't go near the water / 'Cause the water isn't water anymore
(I did turn up one result for water isn't water isn't water (2012), which indicates the same sense: not all water is equivalent).
A substantially more clichéd way to express this idea would be not all money is created equal, being a snowclone of the negation of Thomas Jefferson axiom cum Abraham Lincoln dictum that all men are created equal. There is no shortage of unimaginative headline writing in that regard: not all antenna alignment tools are created equal; not all "I'm deleting my account!!!" announcements are created equal; not all instances of recidivism are created equal, etc.