Question About The Camp Site WiFi

OK so to cut a long story short I've been having problems with my neighbor in the apartment. At the moment I'm living on a camp site and have a place here until 4th January 2020. They've got a public WiFi. Before today I was using mobile credit which runs out very fast when not connecting to a WiFi and needed a credit card to buy time but now it's letting me into some websites like computerforum.com and Hotmail. Others such as speedtest.net and Five Guys still come up with their login page. Just wondering if anyone knows about WiFi and how this is happening without me paying.
 
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