My thoughts exactly. One of the best ways to develop countries is to just invest in a bunch of infrastructure. It probably won't be optimal, but it's better than not investing. It's interesting that the private bubbles in this case form a simulacrum of public investment. Instead of the government raising money to invest through taxes, capitalists just throw it away on fads. Perhaps it even helps to address inequality in the long run.
That said, I'm not sure the effect of digital infrastructure will be the same as physical infrastructure. A road has a clear material impact on all businesses in the area and their capacity to produce physical goods. But do data centres have the same effect? An extra lane on the road means you can get a greater volume of goods in and out to broaden operations to a larger area, but I don't see what positive effect two data centres could have on the average business. For as great as the internet is, I don't know how much value is created here. The question of what to do with a railroad is quite easily answered, but I'm not really sure what you can do with a datacentre. I guess whoever works it out will be decently rich.
But I feel we already have enough computing power, and the bottleneck in the whole process is making software that efficiently uses it (or knowledge of how to operate such software), rather than the power of devices themselves. Though perhaps as the bubble bursts, the price of programmers will also decrease significantly and the software issue will be resolved.