Of course, they have clearly mention under their terms and conditions that:
PCCW and/or the Airport Authority of Hong Kong does not warrant that the Service will be uninterrupted, error-free, or free of viruses or other harmful components.
My favourite part:
You expressly acknowledge that there are and assume all responsibility related to the security, privacy and confidentiality risks inherent in wireless communications and technology and PCCW and/or the Airport Authority of Hong Kong does not make any assurance or warranties relating to such risks.
If you will look bit closer at the above picture, you will notice they also have secure wireless connection known as Extra-Shield PPTP. They are not recommending users to go through secure wireless connection infact letting users to use untrusted Internet connection.
I have a stay here for 8 hours. I have seen huge list of users using this excellent service including students, tourists, business men, etc
Now, do i have to explain to you guys what can be done if someone is connected with insecure network connection? Na, leave it - you guys can figure out yourself !
All my advice to users and people who travel frequently. Please make sure you are connecting via secure network connection. Not everyone is nice like me :)