Only SPL offer mega contracts like Al Nassr's given to Cristiano. Barcelona president said he's trying to sign Messi again but Al Ahli's in talks with Messi because his Inter Miami contract's ending in Dec 25. If Messi wants new experience & mega money he'll go to SPL
Al Nassr did give an extraordinary contract to Cristiano Ronaldo, in this case no one can imagine that at his age which is no longer prime, Ronaldo can get such a big offer, it is truly extraordinary.
The SPL is indeed a very crazy league, they do not hesitate to make high offers for players who they think are good and worthy of being drawn to play for the club, one of which is Neymar and Benzema, both top players in their time.
It does not rule out the possibility of Messi accepting a contract from Al Ahli, of course Messi will definitely get a big offer, besides all that, currently the Saudi League is consistently building its football, it is likely that more and more top European players will be interested in playing in the Saudi League, very likely.