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How do Chainlink Oracles make money?

been researching this for a while. It is my understanding that the job market on Chainlink website, offers jobs for a small fee (in the range of 0.1 LINK). But I also know that according the architecture , and more specifically this article here :

https://docs.chain.link/docs/fulfilling-requests/ , Specifically point number 6 under ‘Create a request to your node’ , it says that the Node Operator (off chain) , needs to have sufficient ETH in order to be able to send their data on chain again (through a callback to their Oracle Smart Contract). This costs A LOT of money, depends on the network congestion and can go as high as 200$ in some cases! This makes the 0.1 LINK fee insignificant.

Does the node operator really pay this? Or is it delegated to the initiator (data requesting smart contract)? And if so does, this mean that to request a piece of data it can cost up to 205 $ (assuming 200 $ TX Fees in peak times + link cost)? Does this make sense?

Any help on how this functions is appreciated.

Zkp that prove that the ciphertext is a reencryption of a cipher from an ensemble of cipher

So I had a question about ZKP protocol, I had to create one by myself and I am not sure if it is valid.I’ll try to explain, if you need any precisions, don’t hesitate to ask. In an election system, the voters are allowed to copy the vote of a deleguate. They need to do::Listen

So I had a question about ZKP protocol, I had to create one by myself and I am not sure if it is valid.I’ll try to explain, if you need any precisions, don’t hesitate to ask.

In an election system, the voters are allowed to copy the vote of a deleguate. They need to do so without any exchange of information with the deleguate in order to avoid the deleguate to get any information of who votes for him.
The protocole here is an attemp to make them able to proove that they copied a vote from a deleguate, a valid vote. Here is a capture of my protocol so far.

Protocole: proof of copy

I did this protocol from a suggestion of my assistant, but as it is my first time concepting a new Sigma protocol i have no clue if he is valid.
Can you tell me if this protocol is valid or close to valid ? Any help in that sense would be greatly appreciated ! I can join the proof of completness, special soundness and zero-knowledge of this proof (even tho I did them really fast) if you need them.

Thanks a lot !

How do Chainlink Oracles make money?

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