On the part of Neymar, this is of course the right decision, he never gave himself completely to football (by the way, as the current coach of Al-Hilal spoke about), and now he has completely sold his talent and money.
The only question is whether he can honestly work out this money? Or again, everything will turn into violations of the sports regime, unscheduled weekends to celebrate the sister's birthday, the Brazilian carnival, etc.
Are we going to deny that Brazilians loves party or maybe everyone are not happy for his choice of clubs and decision. I was one of the people that dislike his stay throughout in PSG and when he made the moves, Al-Hilal has the money and every agent want the best for his client, the more money the player has and priviledges, so does the agent, it can be assumed that Saudi Arabia are ready to spend heaven on earth for European players and that is why the negotiation ended with those incentives and he's worth it in my opinion. Those who will creticise will but if they are in similar position, they will do worse.

The Saudi Arabia clubs want to have name and recognition of their leagues, the money is there, whoever deserves it is going to have it and the fact that Neymar made a two year contract is a wise decision, he can leave after his contribution for another club elsewhere.
This love of parties leads to the fact that for some reason only a few of the Brazilian top players can boast of sports longevity (to be honest, I can’t even remember who to name for example). And now we are seeing that Neymar (given all these patterns and trends) is actually ending a serious career. But he's only 31 lol! Maybe the Saudis think they just bought a top player who still has a couple of golden years ahead of him. But if Neymar behaves like a pre-pensioner, will they part amicably? Or will it be a shameful point in his career? Let's see.