SSH is still alive and well, used by enterprises everyday. Nothing else has replaced it in terms of security. From what I know Windows has never supported SSH and probably never will, but it supports telnet any day. NTFS has file system security and it shares permissions of users logged in that matches to that own account. It's the same as FTP, only SFTP has encryption and uses SSL (built into SSH).
I'm not the judge of what's legal or not but I do have a way to share content. It's like a website, I can go by legality but if I was to go solely on that where would we ever go to progress? By your logic I'd say you would prevent the advent of websites as well if we're calling it unsafe to access another computer on the Internet. Of course, Windows people still believe a computer is called a PC when they aren't at all personal anymore thanks to the Internet.