70%+ net profits margins are for rented infra, that means no major upfont expense. Also, these margins are against 60% utilization only.

You can well imagine if you own your infra and can make utilization over 90%, where these go.

And then, my link above is for K3 model, which, compared to ds flash models, is highly unoptimized.

If I had a few million lying around, I would have invested in inference.