it's to protect capitalism.
the swedish neoliberal government has defunded existing renewables like wind power and set into law that the government is not allowed to buy back the nuclear plants they are now funding with tax money for private enterprises. with the argument that renewable energy like solar, wind and water will break the economy because it runs in the negative with uncontrollable overproduction but nuclear power is a supply and demand resource based on fuel which will let the private owners maintain artificial scarcity to keep prices stable.
bluesky isn't decentralized and never will be. the only reason they would ever consider federating with other servers would be for the purpose of cannibalizing them. they are a for-profit company and as all for-profit companies have done in the past (XMPP) and are doing today (email), the goal is always to kill competition through forced lockouts.