There are indigenous Europeans. Most Europeans are of Celtic/Ionian extraction via the post celtic/ proto geman,  Gemanic tribes (Belgae, Franks, Lombards, Allemani, Saxons, Jutes, Angles,Cimbri, Teutons,  Suebi, marcomanni, etc) mixed with other post celtic gallic tribes and romans (ionians)....late in the 6th cent AD the slavic tribes were added the mix from the east. Later still the finno-urgric tribes.

So yes Europeans are native to Europe (West of the Urals), and have hereditary claim to their ancestry, geography and culture. They have been there sine early stone age at least.

So what is this nonsense about cultural appropriation which has always happened. Goo ideas are good! Acknowledge the source and move on!