I tell you something, it's true. Mbappe left PSG as a free agent. But, it's wrong to say he signed with Madrid as a free agent. Madrid paid him a lot and it goes to Mbappe's pocket. Also, we have not yet seen how Mbappe will perform on his debut with Real Madrid.
And again, Madrid is the most successful club in football, even without Mbappe. It's Mbappe who is lucky enough to be recruited by Madrid.
I don't know what kind of agreement there was between Mbappe and Real Madrid beforehand. But the beneficiary of this deal is of course Real Madrid. They didn't pay any transfer fee to PSG. No matter how much Real Madrid rewards Mbappe, the price they paid to get Mbappe is still too cheap.
I know Madrid is the most successful club in football, but without Mbappe, it would be difficult for them to win consecutive titles. "You shouldn't say that Mbappe is the lucky one" I see it as a win-win situation, you should remember that Real Madrid is just as desperate for Mbappe as any other team. And Mbappe is also hungry for titles, only Madrid will give him a sense of security.