lol you posting this cause monero town is talking about retroshare? I'm not familar with onionshare, but its like Briar right? If it's peer to peer, both parties have to be online at the same time. (like Briar)
I am not the dev behind SimpleX or Session. Session has onion routing built in. SimpleX can do Tor optionally. Onion routing is good, not just for privacy but also censorship, we also just got a new Tor Onion on a new VPS btw:
privacyy3tsy4mge4qmg4nsid2vnhl7szzupphhkfsxvayx5tl2ztbqd.onion