I don't get how MAID isn't still MAD in disguise. If the US or China simply says "any strikes on our datacenters will be met with an ICBM in response" who's goi

I don't get how MAID isn't still MAD in disguise. If the US or China simply says "any strikes on our datacenters will be met with an ICBM in response" who's going to test that? If the "first strike" is just an unfair economic and political advantage... How's that materially different than today's world?