I've seen many definitions of Data Products. Complex ones. Academic ones. Ones that need a whiteboard and 30 minutes to explain.
I prefer a simple one:
A data product delivers value to its consumers.
That's it. Eight words.
A Data Product without quality doesn't deliver value. If it's unreliable, it doesn't deliver value. If it creates no strategic or financial impact, it doesn't deliver value either.
So keep the definition simple. Focus on value, and the right behaviors follow.
And it's short enough to remember.