Which cable are you referring to? Are you saying your cyber cafe has pen-testing tools lying around? Did you confuse regular USB cables with the tools mentioned by OP? It would be weird if your cyber cafe used pen testing cables in every device though, I'd assume they are doing some secret government work or something similar if that was the case. These tools are expensive compared to your usual $5 cables, not to mention you should probably avoid plugging USB into your air-gapped device without any preparation. CMIIW.
You'd be surprised how many Internet cafes and other types of Internet-related businesses, where any user can use a terminal, use penetration testing tools. The curious thing about these cases is that there are times when managers also do not know that their terminals have been infected on purpose to obtain all kinds of customer information. The software most commonly used by attackers are Keyloggers, to obtain passwords for all kinds of services. The same goes for free internet hotspots, the information is stored with the logins of users using any type of service.
After I became involved in Cryptocurrency I stopped using Internet cafes and public Wifi, I just feel that because of the creation of Cryptocurrency hacking has become a lucrative business, and where else can they easily hack accounts, passwords, or private keys but on Internet cafes, hackers are taking their chance on every computer users.
I'm not saying that Internet cafe operators are hackers but some of them are involved in hacking because they own the network, they can install anything.
So if you're involved in Cryptocurrency be aware of how hackers do their things, you are your own bank so protect your investment by being educated.