The ISS is one of the most expensive pieces of infrastructure humanity has built, it costs something on the order of $150B. My home I personally paid for, out of my own pocket, and it has 3x the power power supply of the ISS.
How about this. You give me 10% of the cost of the ISS and that datacenter rack, and I'll use the $15,000,000,000 to buy a big AC system to cool the rack. We both make out. You paid 10x less and got 3x as much power capacity, and I got FIFTEEN BILLION DOLLARS to service and maintain a residential sized power line.
you could absolutely launch and operate a space rack with current tech
If you aren't getting what I'm laying down. The issue isn't the technology, the issue is the many orders of magnitude of extra cost.