Oh sure, Israel managed to astroturf millions upon millions of votes, and manged to control the votes of around 50% of Europe.

Yes, definitely, that's what they did.

Why not?

The main reason I can think of would be that they didn't need to 'astroturf' that many, due to europeans generally being conservative and anti-arab or anti-muslim. But they ran a campaign to get votes, and exactly how efficient it was is very hard to pinpoint.

Zionists have quite extensive tooling and robust parasocial networks for running propaganda campaigns. Why wouldn't they use that to try and become the next host of the Eurovision pop tournament?