Space is like the deep ocean, you never really know what's lurking in the shadows. A well placed pebble, a pellet of paint or a beam of microwaves could ruin a fragile satellite without being none the wiser.

If you want a safer datacenter you put it underground and you can safely assume that if it's hit by a bunker buster you have much much bigger problems.

> We can also assume that placing big fat valuable targets in space would have many actors wondering how to make it cheaper to destroy them.

Yup. See True Anomaly, among others.

you just need one missile, maybe 2-3.

space debris will ruin the rest.

Defense compute can move to bunkers, but that is probably small percentage of overall need