Because SSH might be blocked, and not only trough port 22 blocking but firewalls sniffing traffic and blocking on OpenSSH in the connection (eg. SSH-2.0-OpenSSH_8.1).
Then this stuff would also be blocked for the exact same reason. And if it isn't, you will probably be fired for knowingly and willfully circumventing security measures.
I have gotten around this by hosting SSHD on web ports before, or going through a SOCKS proxy.