I went to the piratebay website today, but was getting a cloudflare error. 

So, I did a search and found this thread on reddit, from November 2018....

https://www.reddit.com/r/newzealand/comments/a14def/isp_or_new_zealand_blocking_thepiratebayorg/

So it seems this has been happening since november 2018. 

[edit]  I also checked using a vpn and it works just fine, so I guess spark are now censoring knowing pirate websites.