You don't see the Spanish and the Germans speaking in their tongue, not to mention the Russians. France is the ONLY ones, and that is down to pure arrogance.
Every country have their own presenter to explain what is happening to those who don't understand English.
Spanish is spoken in Spain, that's it. French is spoken in France, Belgium, Switzerland, Luxembourg and that was a lot when there were less countries in competition when rules were made.
Also the hosting country uses its language or english when it's a second official language.
Arrogance has nothing to do with this lol
Singing in french nowadays, maybe though.