Somewhat related, OpenSea recently announced they will no longer enforce the mandatory payment to artists when an NFT is traded, removing one of the main incentives to publish this way: https://hyperallergic.com/840325/the-only-good-part-of-nfts-...
Paying royalties is entirely optional. What's built into the contract is a calculation of a value for royalties to be paid, but it's up to the marketplace to use it. Other platforms already ignored it.