If your assessment of GeForce reliability is correct, then there's no need for the clause in the EULA at all: people will try to use them in a datacenter, they will fail, and people will use the DC-oriented cards instead.
But that's not the case. Many people are finding they can use GeForce cards in a datacenter just fine, and it's cheaper than buying the DC-oriented cards. This is a money grab, pure and simple.
Not to mention that the EULA has a carve-out that says blockchain processing is permitted. So nvidia is even acknowledging that there's no hardware reliability issue.