Well Mbappe is a Parisian for a start. Messi literally couldn't stay at Barcelona and take a pay cut so was made to leave by FFP. Only PSG could come close to matching his salary.Yes, just as Messi, Neymar and Mbappe saw the logic of going to PSG.
But then again, it's not even a fair comparison because the club prestige and tradition between Bayern and PSG are not exactly equal footing.
Neymar is a mercinary knob. He also went to PSG because he didn't want to live in Messi's shadow.
It didn't work.
So really none of those examples are comparable