Most of the spam call centers originate in countries where the governments don’t _really_ care all that much. For example, a good number of them are in smaller cities in India, where the politicians are willing to turn a blind eye for the right price (and so long as they don’t go around scamming Indians).
From there, the call centers are just another overseas call. There are a number of _legitimate_ call centers in foreign countries, so looking to block the scam ones is a needle in a stack of needles. Its a ton of effort for the phone company with little actual benefit to them.
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