While I was browsing the tanki homepage, I accidentally opened the google chrome console and saw a js file with the players on each server so I decided to make a really simple web page with those numbers. The website is still online here: https://www.gb-factory.com/tankiserverload/ I later added the test server statistics.
Now this project is abandoned and has been merged with TankiTools, a new project with useful tools regarding Tanki Online. You can find the TankiTools repository here: https://github.com/gb-factory/TankiTools