Telnet, yes - it's been very effectively replaced by ssh, but ftp still lingers on since so many people keep on trying to reinvent it badly instead of settling on something better.
There's so many fucking homegrown web things that don't even support REGET or similar instead of supporting something built on ssh or anything else that works effectively.
Hence people using Dropbox even at the fumbling start when it was a security joke even worse than plain FTP (it got better later). People wouldn't have put up with that if there was a widely used alternative.