I don't know that they're building anything to be honest. I think it's just waffle to appease shareholders.
Maybe there is an opportunity to do regulatory arbitrage in international markets, but how long before those loopholes get shit down?
I think nostr for contracts would be easy. You sign a contract and both save a copy. The docs don't need to be accessible by third parties all the time, so it would be a lot easier than doing social media I think.