I am wondering what can be harmful if you live only inside tty... Ascii-art porn would be an interesting conept...
In the ASCII serial terminal days (mostly up to the 1990s?) - there was prn. There were actually entire (link to Wikipedia)
USENET groups that carried prn. Was the prn displayed in ASCII on your 24x80 line ASCII tty terminal? Well... maybe?
But mostly what happened is that Users would run (link to FreeBSD man page)
uuencode(1) against binary data (aka binary formatted images, Office Documents, other proprietary binary files, etc) to turn that data into 7-bit ASCII "printable data". The 7-bit ASCII printable data would then be sent over USENET as a newsgroup posting -- to the world (?).
7-bit ASCII printable data was passed over the "network" between UNIX/Linux/*BSD/etc machines -- because at that time (most) of the network traffic between Unix hosts was being transmitted over dialup modems using uucp(1) (Unix to Unix CoPy).
If a User wanted to view uuencoded data that was sent to the USENET Newsgroup they would run (link to FreeBSD man page)
uudecode(1) to turn the received USENET newsgroup contents back into native binary again. The User would then display the received binary data on an appropriate device or route the binary data directly to a local printer, etc.
In the "late stage" of USENET readers -- a User could just hit a key (like "a") on their keyboard and the just received Newsgroup posting containing uuencoded data would be automatically uudecoded and immediately displayed on the Users terminal (assuming an X session, native Windows, etc).
In 2026 terminology "uuencoded data" is now called
BASE-64 encoded data. There are libraries on FreeBSD (and pretty much all other Operating Systems) that know how to process BASE-64 encoded data files.
Did USENET posts from States make it "over the pond" to Europe and elsewhere.. I do not know

. I am sure the
long distance international telephone call charges from States to Europe racked up by 300/1200/2400/4800/etc baud dialup modems was expensive ($$$$) for somebody though! AT&T, British Telecom, Deutsche Telekom (and others) were real happy ($$$) for the long distance, long duration modem calls going "over the pond" regularly.
And that... is how the Unix was won !