Honest question - why are they there then if not to make money? What other reasons exist for selling NFTs if not to make (quick) money? I'm genuinely curious here :)
He did say "not to make a quick buck" and not to not make money in general. As an artist, it's cool when you're getting paid for your work, but it doesn't mean it's the primary motivator for everything you do.
NFTs act as unique instances of objects that can be “digital shadows” of real physical objects, or their own thing, wrt the blockchain they exist on.
For the art world, they are a new medium and can be used to secure provenance. In the rest of the world they are being looked at as mediums for selling tickets or keys to access unique experiences (an art piece/door/puzzle that activates or lights up if presented with a valid NFT as a simple example) among many theoretical use cases.
A lot of crypto stuff doesn’t make sense unless we get Decentralized Identities (DIDs) right, so things like NFTs can be associated with with a user.
Artist share their work on Instagram, Tumblr, and tons of other social networks for free.
Why do they do this? That doesn't make any more sense either.
About your question:
hicetnunc.xyz is basically like Instagram but with an easy option to support the artist by buying their creations directly from them as a NFT.
They can showcase their creations, get discovered, and make some money on top.
as in any other space it is hard for most artists to get attention for the work that they doing. If you want to get attention you have to share some of you work for free. However, the images you see on those platforms are usually not high resolution and don't come with any usage rights. Those are then the things artists get paid for hopefully.