Where do staking rewards come from? What economic activities in staking generate the value that in turn generates the money that we all get paid as returns in the form of coins?

Staking has become a big trend/ deal/ medium of participation in Crypto, has grown very rapidly in the last 2-3 years. But when SEC barred Kraken from running Staking service, my first reaction was furious but as I started thinking more - how does SOL generate 5% rewards, DOT used to pay 12% and LUNA (when alive) was paying 20-30% rewards and so on - I struggled to put two and two together - so, how is this money generated?

Anything that pays money (rewards are basically money paid in the form of coins) has to be exchanged with value in return to the payer of the money. I can see in proof of stake, nodes commit tokens to be able to vote, validate transactions etc. but how does all of that generate money? Is this how PoS smart contract are written? That would be part of the supply goes to stakers?

What would be relevant parallels to understand this better? For example, I deposit money in the bank, the bank loans it out at 10% and gives me 5% back, keeps 5% to cover its operations and profits. What is an equivalent analogy for staking?