It did in every other country that did it. What's different about this one? If you get a spam call in Europe from Europe, you call the police and the spammer gets located and punished.
Europe does not consistently have KYC for phone service, at least for mobile connections. Normal phone companies in Ireland don't ask for information when buying SIMs (physical ones, at least). Some eSIM providers in Europe don't ask for information at all, and accept cryptocurrency payments. (I'm also aware that some other European countries have very different requirements, up to actually needing copies of identification.)
More widely, however, there do seem to be differences that I don't know the details of. VOIP seems quite different (I use it for my old phones): DID numbers in the US seem extremely cheap and available instantly, with little information, while European ones seem to have an actual verification process and prices that would make large-scale spamming difficult.
As an additional anecdote, I've never heard of a number-porting/2FA attack using social engineering or other methods in Ireland - but we have our own unique issues now with Robocalls and phishing on WhatsApp and SMS.
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Has it?
Spam calls frequently don't have a source in the same country as their target victim.