Well, it is sad but it is a truth.
Several french clubs were happy when PSG bought Neymar because they knew they would get more money and the league would get a better appeal. Even the LFP CEO said he managed to sell the TV rights for a bigger amount thanks to the star power of PSG.
From the own words of Dortmund guy, he says it will be good for the "appeal of the league". They know they can't compete financially with Bayern, the same way french clubs can't compete with PSG. So, it is better for them if, at least, something good comes out of it. It doesn't mean he is not ambitious.