Hello Manfred, thanks for your reply here, I have been sent here from a Reddit post.
There is already a Java RPC implementation for Monero, however you still need a full node running and probably nobody from Monero will want to maintain a full Java node implementation in parallel, since Monero hard forks every 6 months to integrate new features and it’s hard enough to make the base C++ implementation stable and secure. Like Bulletproofs implementation has been recently audited by three different external entities.
Monero’s Multisig implementation offers the same level of privacy like every other transaction.
Well, I assume these coins had no significant support at all on Bisq and this is obviously not the case for Monero and we see like 90% of all volume on Bisq is between BTC/XMR. I think most serious Monero users hate to use centralised exchanges with all the KYC eg., so also LocalMonero even when it’s a quite young project, it has pretty much volume already for a single coin marketplace.