Mr. Adelson cannot afford to be controversial, beside the fact he may genuinely support the Likud.
There are several other super rich Jews who are much more likely to be a potential patron of JTF: Ira Renrat, Irvin Moskowitz, and there are a couple of other individuals who fund the Jewish settlement in the city of David.
There is Guma Aguiar who returned to Judaism thanks to rabbi Tovia Singer, he is also now the de facto owner of Beitar Yerushalyim football club.