It wouldn't stop it. But Saudi probably feels that it will help reduce it.

Who knows how many people overstay visas, and from which countries they come from.

But I was conservatively estimate that 90% (or more) who break the rules are poor people from poor countries who do not have biometric passports.

Maybe 10% are from Europe or America with biometric passports, but it's still a reduction in visa violations.

Saudi's borders, Saudi's rules.