[aaron_scotland]

It's part of the format, there's not much in terms of the structure of the show that the host broadcaster can change, just artistic stuff. It's the EBUs show

That said some ideas catch on and become regular features, like the flag parade

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Also there is a different non commercial version of the show for those broadcasters who are ad free. The main feeds have sponsorship on the stings and graphics. If you have the app the splash screen of that gives an idea of the sponsorship

i.imgur.com 

Though amusingly, even in the UK the BBC doesn't get a sponsorship free feed as they just cover the logo with a blue square, you can tell as it isnt quite the same blue.