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Saudi Arabia is a very wealthy country vast in abundances of Rich minerals resources so money isn't a problem for them. Signing Cristiano Ronaldo to play in their domestic leagues and also been a major sponsors of the Club world cup doesn't mean they will still be promoted if they failed to qualify to the next phase of the world cup. FIFA have setup rules in every football competitions and the world cup is not an exception. If Saudi Arabia failed to meetup with the rules of the game,they wouldn't be allowed to progress further.
You didn't had an issue when Qatar hosted the world cup, and thereby gained automatic entry to the tournament in 2022? The same is happening next year, when three countries (USA, Canada and Mexico) are granted automatic entry. So this is a norm for the FIFA World Cups. The fact that Saudi Arabia can spend massive amounts of money in sports, unlike the bankrupt European nations should not be used to blame them. Perhaps the European governments should focus on improving the infrastructure in their own nations rather than spending billions of Euros to import Syrians and Afghans to their country.