How hard is it to build orbital data centers, actually?

"The ISS radiators are expensive and heavy. We're focused on making them cheap and light." https://arstechnica.com/space/2026/07/how-hard-is-it-to-build-orbital-data-centers-actually/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social