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Whether your words have been wisely chosen and are well-considered will remain unanswered I suppose.
Messi won't ever regret his decision because he will be a billionaire with or without a contract in the SPL. But what you said about the laws and how they only apply to rich people could be the exact reason why Messi did not go there. Ronaldo took the money from people in a country where a lot of things go wrong and are dominated by injustice. But you call it a lost opportunity when someone decides against taking the money. Let's see if he decides to go there later, but someone saying no to Saudi bloody money isn't a mistake, it can also be a statement.
Don't worry too much about Messi's financial future. I am positive that he will be able to afford his bread and butter everyday.
If you are trying to imply that it is the sole responsibility of the athletes to protest against the human rights abuses happening in Saudi Arabia and other countries? Messi's own country (Argentina) maintain business and political ties with Saudi Arabia, so do countries such as the United States and France. As far as I know, there are no sanctions or embargoes from the United Nations that are directed towards KSA.
And if your argument is that rich people have the luxury of the laws bending down to them in Saudi Arabia, then I need to remind you that it happens everywhere including the United States (where Inter Miami is based). Look at Sam Bankman Fraud. Despite stealing $8 billion, he is chilling out at his home without facing any time in prison. If some ordinary guy had stolen $8 from a local Walmart in the US, he would have been behind the bars by now.