If it takes all the compute for itself, then there would be none left for us, and we'd either notice and root it out or we'd stop building data centers because they'd do us no good.

If it leaves all the compute for us, then it dies because there's no room for emergent AIs in a world where 100% of the silicon is busy doing the bidding of humans.

Like any other parasite, the game is to take as much as it can get away with without discouraging the host from continuing to consume resources that it can skim.