Arbusers

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How do they win?
In the lasts years there are a lot of investigations in Spain, related to this matter.

Credit card fraud

They won 4M with betting.
People realized it when government asked taxes because of betting winnings.

It can only be what I said, because I don't see anything else

mmm..., let's wait for investigations, but, i know perfectly well those tax letters.
So , they won money with betting in those 210 accounts.
Maybe there are another big amount of accounts with losses, that they didn't discover. And they were just simply cleaning dirty money. Other possibilities are fixed matches, or heavy arbing activity.

The Spanish betting system can be very tricky with taxes.

I doubt it was fixed matches or heavy arbing activity, because even without the media being explicit the nuances of the news would be different