[rumblecat]

Currently it's done through the marketplace platform, so actually commissions don't track when you sell through other platforms. EIP-2981 aims to standardize this.

Depending on your view of platforms, this could be less than ideal. It should also be possible to modify the transfer function in the EIP-721 contract to be a swap, but this would require a new standard. In any case, it could be gotten around by an escrowed transfer with swap amount being set to 0. I don't think there is a way to prevent this.