This protest achieved nothing so far.

I’m not saying the protest solved the issue, I was merely explaining why I disagreed with your arguments. Please don’t try and make me say things I didn’t.
As for the protest achieving nothing, I’m not sure how you back up that claim. It definitely changed how google is perceived by a few people who care a lot more about the genocide than they do about online privacy and ads. It also, sadly, probably made more employees afraid to express themselves on their workplace.

If you want to actually make a difference, leave Google, go do bioinformatics (am biased here), exact agriculture or any other shit that actually solves real problem.

There are countless ways to try and make a difference. I could argue that your work in bioinformatics is meaningless in a capitalist world and that you should either take up arms and organize raids to execute CEOs or do nothing (I actually disagree with this point, it’s just an extreme example).
Let’s not discourage the people who try and do things. Maybe they make mistakes, maybe they could be more efficient… but at least they try.

All I see in those rallies a bunch of people that work at Google to maximize their earnings that are mad when Google does the same.

Of course they’re mad. They went to work at Google, not Lockheed Martin or “insert other weapons manufacturer here”. And it’s a good thing ! Of course they still sold their time and skills to a shitty company and had an overall negative impact on the world, but they still care about human suffering when they are aware of it, and I prefer that to people who don’t care at all.