How this is possible to generate blocks with no transactions?

How this is possible to generate blocks with no transactions?

I found this block in blockchain explorer. It is pretty well confirmed, but it has no transaction inside, except "Newly Generated Coins" one. How this can be possible and what for?

Additional question: If this is so easy to generate such blocks, what stops miners to generate these (lightweight) blocks as many as possible to earn new bitcoins? Thanks.

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