Many Patreon payments are simple donations, or gated access to digital media. These can be achieved with smart contract functionality to mitigate the need for costly payment processing.
Yes though I would point out that smart contracts require some knowledge of coding knowledge to implement....
Yes, a theoretical crypto-Patreon would have to be coded in Solidity and frontend interfaces built around it for the web. This might be OSS or just a private enterprise.
But the users of this platform do not need to know how to code.