Given that the Israel/Palestine conflict has huge support groups on both sides, it's also plausible that the Israel votes were just genuine, if politically motivated Israel supporters.
But some smells are definitely there.
To get more information about the conflict, I had subscribed to the newsletter of the Deutsch-Israelische Gesellschaft, one of the largest pro-Israel lobbying groups in Germany. Lo and behold, they sent out a mail to all their subscribers on the day of the final, calling to vote for Yuval, with phone number and everything included. They had done the same thing last year as well.
I'd classify this as a "gray area", as the subscribers of that list would be very likely to be hard-line Israel supporters anyway. However, not all of them would be interested in the ESC or would know how to vote, so it's definitely a form of mobilization. (I assume similar organizations in other countries did the same)
What I found more suspicious is the massive amount of online votes that were given, according to [1]. First, it's remarkable that online votes make up the lion's share of all votes, absolutely dwarfing phone votes. This is even though the show itself still gives the impression that voting is mostly being done by phone.
Also the total amount of online votes seems to have grown much more steeply between semifinals and final than the total audience. That seems to suggest some kind of brigading going on - though it still doesn't say anything about how organized it was.
[1] https://escxtra.com/2025/05/19/rtve-asks-for-audit-of-spanis...