You can always ssh to random hosts and read the netbanners.
Of course nearly all of them are a long paragraph or two of legal jargon that more or less boils down to "fuck off."
SSH banners come over TCP, requiring the 3-way handshake first, meaning you can't use it for traffic reflection (beyond the SYN-ACK itself).
While not a random server in the internet, here is the start of the ssh banner on my router (before the legal "fuck off")