Almost a decade ago a French mobile carrier had their entire domain and subdomains zero-rated - one of the subdomains had a phpBB forum - someone created a litt

Almost a decade ago a French mobile carrier had their entire domain and subdomains zero-rated - one of the subdomains had a phpBB forum - someone created a little script to tunnel full layer 3 communication over the forum’s private messaging functionality. I’d imagine it would slaughter the DB if you tried to pass any significant traffic though it but as a demonstration it was cool and worked fine.