We are kind of talking past each other. I'm saying something simpler. This all goes back to the original point I made in reference to your reply to johnfn:

>> The post is factoring in training costs, not just inference.

It is not because training costs are irrelevant here. Training costs do not cause your costs to go up as you accumulate more users.

None of these calculations we're talking about include training costs. You're saying that inference is unprofitable (at least given the subscription plans). I'm simply pointing out that we are talking about inference not training as you stated earlier. You are (very accurately) not talking at all about training costs.