I’m using Signal, but after I found out that it’s not as privacy-friendly as it claims, I’m uneasy about sharing my address there. I trust the person who asked for my address, but not the service. What’s a safe way to share? I was thinking of something like a self-destructing pastebin, but surely you have better ideas.
Signal is OK if you are not a sensitive target. Otherwise you should use other ways, like using privacy and security focused operating system (the most famous is Tails, but QubeOS is probably better and there are many more), a reliable and completely anonymous message system like tox, or at least p2p like briar. There are a lot of countermeasures that you should consider if you are a sensible target, and none of those are failure proof