Hello
If I sell procedurally generated 3d models on a marketplace such as cgtrader or turbosquid created with houdini, would I have to renew my license each year the 3d model is available for sale in the marketplace since it was created inside houdini.

Would It be okay if at a later time If I can't afford renewing houdini every year I still have the 3d model that was created in houdini available for sale.

You would only need the Houdini license to create the asset that you bake out.

The same would go with Houdini Digital Assets except you may need a license to update it later on if Houdini changes. Since assets are made up of node networks there is always the chance a node has changed or a new better node is available.