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Because Elden Ring took 4 years to develop, 5 years if you include the DLC release time. You would need to amortize its very front-loaded revenue over those 5 years, because a live-service game like Diablo Immortal would be generating somewhat consistent revenue throughout that entire time.

Let's say ER reaches 20M + 8Mx2 for it's two upcoming DLCs @ $40 each. That's $1.8B lifetime. Pretty amazing! DI would need to make $360M per year to be an equivalent business. So 800k in the first 24 hours is not too far off track to being equivalent.