Some questions about modern Synthetix...

Synthetix has changed a lot over the years. How about a description of the current state from the ground up? "What is Synthetix?". A lot of descriptions of Synthetix are stale. I think I get the gist of it (because I read the blog posts) but I still feel like it could be clearer.

1. How is Synthetix keeping orders private once they settle on-chain? Privacy in a CLOB is easy to understand, but on-chain everything is public so what technical measures are being used for privacy? I haven't heard any mention of zero-knowledge proofs, but there are probably other ways to achieve privacy as well. What is Synthetix using?
2. Is Synthetix going to re-add tradfi symbols such as TSLA, AAPL, and Gold? They were removed because they didn't get much volume, but now that Synthetix is using an off-chain CLOB wouldn't they essentially be free to support? It didn't seem like the tradfi symbols got much time to get discovered and prove themselves before they were removed.
3. Decentralized? Contract(s) Renounced? Plans to? The 'd' in dApp stands for decentralized. A dApp with a non-renounced contract is centralized, masquerading as decentralized. It's contract data can still be manipulated by a central party.
4. How is gasless trading funded? By SNX stakers or from decreased position size like Cow Swap? or some 3rd party?