Once to Amazon, once to Smashwords (or D2D, same company now), once to Google.
1) They have to know who you are, maybe you put up pirate content.
2) USA companies required by USA law to have tax details of even of foreign resident non-citizens (USA calls them aliens).
3) They have to know where to send the money.
The tax info needs reconfirmed every few years.
Amazon is so big it's best to have your own KDP account. Same applies to Google (though more important for apps).
It's not onerous.
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