I've worked for two, both inside and outside Israel, and both were very successful. The same thing happened both times.

1. Foreign Jewish VCs pumped money into it, gave the founders plenty of autonomy.

2. The internal network of the founders to other successful Jews was gigantic. Even if they're unimpressive themselves.

Essentially easy access to capital + domestic and international network that can facilitate success. It's a nationalized version of YC.