It was never a alliance, more like a "pact of mutual interests", since Finland needed to get back the lost parts, especially Karelia, which is the birth place of Finnish culture. Also Mannerheim and Ryti, made it very clear to Hitler that it's not a alliance, but Hitler went and held a broadcasted talk where he stated that finns were allies, but that was only a one sided declaration.

Finns did declare the war, no one is trying to hide that. It was also shown as a obvious offensive war, since the nation was eager to get back the lost areas and the other areas containing finns. So basically we learned that in the winter war the bad guys were the soviets and in the continuation war it was the finns. Which I agree with.

This is what I learned in school during the 2000s and 2010s.