Question about oracle selection

Great to see the team is creating power oracle! I’m wondering how its compared with Chainlink oracle? Why not just use Chainlink?

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Its from the article that was published:

“Developing PowerPool, we faced a problem — there weren’t any trusted and publicly available price feeds for certain GTs on the market. Therefore, we decided to develop our own oracles to use trusted price feeds of any assets to allow secure and reliable PowerPool operation and contribute to the development of the Defi ecosystem as well”.

Which probably makes an chainlink’s oracke expensive solutions.

Here is the article link:
“Power Oracle: a decentralized cross-chain price oracle” by PowerPool