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Besides the usual 2.5% commission, NFTs minted on OpenSea are known to be free to list with a price since OpenSea does not take custody of the NFT anytime during the sale process. Does it though as soon as an offer or sale is accepted on an NFT that was listed there?
Why does OpenSea run gas free for sellers, whereas alot of curated NFT platforms charge gas fees?
https://opensea.io/blog/announcements/introducing-the-collection-manager/
The new collection manager allows creators to make NFTs without any upfront gas cost, as the NFT isn’t transferred on-chain until the first purchase or transfer is made. We call this lazy minting.
Anytime a write happens to the blockchain gas fees have to be paid.
There is nothing special about OpenSea's smart contract that allows them to avoid paying gas fees up front when creating the NFT.
OpenSeas creates an NFT, but defers writing to the blockchain until time of purchase. At that time gas fees imposed on the buyer to assign ownership of the NFT. The approach encourages sellers to list more items because they will not need to pay any fees up front.
Some users may object to this because if an NFT isn't written to the blockchain, then they do not consider it a real NFT because the non-fungible aspect derives from being written to the blockchain.
Partial answer:
Why does OpenSea run gas free for sellers,
... whereas alot of curated NFT platforms charge gas fees?
Competition. They've probably done the sums and think they can make more this way.
From the docs:
Note that we might wait until gas prices aren’t exorbitant to transfer bundles.
It’s possible to bundle up to 30 items and sell them in one go!
I imagine with their 2.5% fees that they're able to cover the gas cost of selling.
