On a more practical level, most internet infrastructure firms based in the US or Europe probably don't have that many people on staff who are fluent in Arabic, Pashto and other languages that would allow the quick identification of terrorists, as opposed to normal people who sometimes discuss terrorism as spectators of the news.
True, but these weren't terrorist propaganda sites, they were the official websites of Hamas & Co, and they do have an english version for anyone not familiar with Hamas. Zoho apparently is providing Email to them.
It being their official sites gives those value / legitimacy and makes them even more okay to not kick them off. Kind of like there should be hardly anything the US president can do to get kicked off twitter.
The US president isn't classified as a terrorist (organization) though, while Hamas is. CF's argument was that they weren't providing material support, otherwise they'd be breaking the law.
