Euronews have an article about greenways in Ireland. One of the routes mentioned is the Great Western Greenway in Mayo and how the landowners generally allowed permissive access to the land at no charge.
What is not mentioned is that this is not a long term, sustainable solution as such permission can be revoked (as has happened on occasions) if an issue arises – even if this is nothing to do with the greenway.
It also establishes a bad principle which is that individuals should give access to their property for free, in order to allow others to profit from the provision of services to those who turn up to use it. Just as the principle that the polluter pays is now accepted, the principle that those who benefit from a public good should pay for it, needs to become established.