in a competitive marketplace, economic profit will go to zero. so whether an AI company buy or rents outside infrastructure, or builds it itself doesn't matter, it makes no difference. Therefore, if your argument is "outside infrastructure X", you can see the meaning of that by looking at "assume the company bought up the whole industry including outside infrastructure, then go back and look what I said and it still applies" A company monopolizing outside infrastructure for its own use would not abuse its monopoly against itself, but even if it did, makes no difference the extra profit and extra loss would balance out. Would it abuse its monopoly against downstream customers? if we use the existing market prices unchanged in our example, that is analyzing the case where it does not, which is the case that is comparable to the current situation.

or to put it another way, let's say these are all publicly traded companies competing. What if I told you "hey, i've investigated the ownership of all these public shares, guess what, Elon Musk owns them all, he owns every share of every company in AI, and all the infrastructure suppliers. Does that change the analysis from what we see in the marketplace? no, it doesn't. You want to draw a bigger circle around more affected parties, the suppliers to the infrastructure suppliers: OK, Elon owns those too it turns out.

nobody is analyzing the future here, we're talking about the case of AI going bust, not trying to predict AI going bust.

if were were going to project the future, we still would not do it with a simulation using functions to model companies to try to come up with meaningful profit numbers, we would project profits (and costs and revenues) based on margins of similar industries