My skepticism would stem from the usual corporate firewall scanning. I routinely get blocked going to innocuous things which are on an uncommon domain or are otherwise on some block list. Recently, I could not visit the DuckLake homepage which is on the .select domain.

That torrents and/or porn are not hard blocked is surprising. For the low volume, I suppose anything can get through.

Does FB not have the equivalent of GoogleGuest SSID which is open to public unauthenticated where reachable?

I've certainly downloaded Ubuntu over torrent on that wifi.

Large tech companies rarely block internet access, since internet access is critical for employees at tech companies.