(I get that you're being ironic.)
I do.
Specifically because of who doesn't.
My neighborhood is across the street from a company that specializes in the repair of hydraulic hammers, a water treatment plant, paper mill and recycling center and a freight rail so we've got it pretty good as is but I see no reason not to continue improving.
In this respect there is very little difference between a NIMBY getting mad about a data center and getting mad about a new housing development that will make the area more crowded and use more water.
The only difference is that you yourself are mad about data centers. If you are a YIMBY generally-speaking try to see how the anger you feel about data centers is like the anger your opponents have about new housing, and let that empathy make you a more effective YIMBY.
It sounds more like you are saying YIMBY but imagining MIMBY (maybe in my ...) where you've just replaced those other guys making the decisions with your own cabal?
Relaxing zoning laws never meant throwing them completely out the window. It has always been a matter of pruning zoning rules that overly restrict land use to the point that minor deviation from the norm is impossible.
Such a change does not permit a massive datacenter, or an oil refinery, or even a 5 story apartment building to be built. The laws aren't being pushed, they are being purposefully changed.
Now if some city council members get an attractive offer "for their constituents" to rezone a plot of land to build a datacenter on, that doesn't really have anything to do with the original zoning restrictions, and certainly is not affected by the YIMBY efforts. Zoning reform is not a strategy to reduce corruption.