From the faq (http://8th-dev.com/faq.html):

q) Are there any restrictions on who can use 8th?

a) Yes. Due to Israeli export laws, residents of the following countries may neither use nor purchase 8th: Cuba, Iran, Iraq, Lebanon, Libya, North Korea, Palestinian Authority, Sudan, and Syria.

WTF! This is the very deal-breaker for me...

Either if these are dealbreakers for me but this crap is just weird. Is that more common; last week we had that German bigot with his scientific software and now this...

I think there's a big difference between being restricted by national laws and deciding to personally exclude countries.

I agree, but it is still not very good. And in some countries you cannot really leave, Israel is not one of those so in some ways this is a personal choice of the author.