If there are 25 candidates, how many votes do you need to come in second? And how many supporters do you need for those votes, when it's pay-to-vote and everyone can vote as many times as they want?
The fact that Israel didn't win the popular vote suggests that the support for them is not particularly strong in Europe.
You don't need much support to win when everyone else's votes are split between 24 candidates.
And there is already a precedent for strong popular support. In 2022, Ukraine won the popular vote with 439 points, with 239 points for the next country. This year, Israel lost with 323 points vs. 337 points for the winner. Ukraine, which came in third, also got pretty close with 307 points.
Similar forms of activism, such as petitions and protests, are supposed to demonstrate support for something, but they often end up showing the opposite. Because the absolute number of supporters rarely matters. What's more important is the number of supporters as a fraction of the total, or relative to the expectations.
Once upon a time, I was involved in something controversial. There was a petition opposing us, with a very large number of signatures for that context. But the petition ended up strengthening our case, because it showed that the opposition to our plans was no more widespread than what we had assumed. The next elections proved us correct. A large number of people with a particular opinion didn't matter, because they were a small enough fraction of the total.
OP described this system as "it's pay-to-vote and everyone can vote as many times as they want".
This sounds exactly like the scam that the right wing runs in America regarding the "Best Selling Book lists". There are a number of right wing books on the list each year but it turns out those books are purchased in large bulk by right leaning groups funded by billionaire donors and are then handed out for free at events or dumped on the clearance channels. It gives a fake impression that the books are more popular than they really are and is in effect a way to blunt the effectiveness of left wing thinking.
This is also done via channels such as PragerU. Right leaning groups funded by billionaires produce white papers describing their thesis which are then sent out to groups such as PragerU and Ben Shapiro in the form of talking points to be inserted into the narrative of their videos.
The fact that Israel didn't win the popular vote suggests that the support for them is not particularly strong in Europe.