Combined with the increased cost effectiveness of renewables & batteries, & the new build-out of nuclear, it could plausibly speed up the clean energy transition, rather than just disincentivising building out more polluting power plants.
There are two main options for what to do with revenue from a carbon tax. The one that makes the most macroeconomic sense is to use those proceeds to fund subsidies for clean energy roll outs & grid adaptation. You are directly taxing the polluting power grid to fund the construction of a non-polluting power grid. As CO2 emitting industry (and thus carbon tax revenue) declines, we have less required spend on clean energy roll out, so the tax would balance nicely. The downside would be that a carbon tax would increase cost of living and this does nothing about that.
The other option is a disbursement. Give everyone in society a payment directly from the proceeds of the carbon tax. This would offset the regressive aspects of a carbon tax (because that tax would increase consumer costs), and would also act as a sort of auto-stimulus to stop the economy from turning down due to consumption costs increasing. The downside of this is that the clean energy transition happens slower than the above, and that there may be political instability & perverse incentives as people maybe come to rely on this payment that has to go away over the next few decades.
They're both good options. I don't know which is better and I think that's likely something individual countries will probably choose based on their situation. But we do need some sort of way to make those emitting CO2 pay for its negative externalities.
I think the rapidly decreasing costs of renewables and storage are likely to make the transition happen before the political will to get a carbon tax, but if you recon you can push the right buttons, I encourage you to try it :)
Because whether we're using tons of compute to provide value or not doesn't change that we are using tons of compute and tons of compute requires tons of energy, both for the chips themselves, and the extensive infrastructure that has to built around them to let them work. And not just electricity: refrigerants, many of which are environmentally questionable themselves, are a big part; hell, just water. Clean, usable water.
If we truly need these data centers, then fine. Then they should be powered by renewable energy, or if they absolutely cannot be, then the costs their nonrenewable energy sources inflict on the biosphere should be priced into their construction and use, and in turn, priced into the tech that is apparently so critical for them to have.
This is like, a basic calculus that every grown person makes dozens of times a day: do I need this? And they don't get to distribute the cost of that need, however prescient it may be, on their wider community because they can't afford it otherwise. I don't see why Microsoft should be able to either. If this is truly the tech of the future as it is constantly propped up to be, cool. Then charge a price for it that reflects what it costs to use.