I think I phrased that wrong: you are right, registrars are not more susceptible to DoS attacks. But, because they are hosting DNS for more domains, if one of those domains gets attacked, you are more likely to get affected.
And like I mentioned in the article, because DNS hosting is just a value added service, they're also less likely to care to fix it and keep their service reliable and running.
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Not more susceptible to attack
I think I phrased that wrong: you are right, registrars are not more susceptible to DoS attacks. But, because they are hosting DNS for more domains, if one of those domains gets attacked, you are more likely to get affected.
And like I mentioned in the article, because DNS hosting is just a value added service, they're also less likely to care to fix it and keep their service reliable and running.