The biggest regulation of building in space is... where do the debris go. You are tightly monitored for how much trash reenters into the atmosphere, so there is still SOME level of regulation.
As far as I can tell, there is no environmental regulation of how many kilograms of aluminum, silicon, etc. being added to the Earth's atmosphere when a Starlink burns up during re-entry.
cf. https://www.supercluster.com/editorial/forty-year-old-loopho... https://aas.org/about/governance/society-resolutions/atmosph...