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As far as I know, IPFS is just a protocol. It doesn't have an incentive structure just like http or torrents don't. Couldn't find anything on their website either, though perhaps it's hidden in there somewhere. Either way, blockchains can utilize IPFS and build their own incentive structure around it, like DECENT is doing.

You are correct. Although, the point is to have the incentive mechanisim abstracted from the storage layer.

Filecoin is the incentive structure being developed for IPFS currently. Pretty stealthy rn - heads down.

Decent is cool. Will be one of many. Standards will prevail.