Their profile is: the very best (and in some cases highest profile) players that are willing to move there.
That leads you predominantly to over 30s and Muslim players, often both. There will be the occasional mercenary type, who will probably have a super agent, and will happily take the biggest offer - here is where you have Neves. Neves is a top, top player for that level.
Bernardo? Doesn’t strike me as that type of guy but if the offer is big enough it makes it difficult to refuse.
Eventually the Saudi League will start to target young prospects from South America and, well, everywhere else - promising crazy money and game time to develop in a league that people are talking about and that improve the overall quality of the league.