As I see it, this is contract law. When you buy a license then you contract into the terms and conditions of that contract. This contract law can then be sorted out in court if there is a dispute. If you break the contract then you should lose unless the terms of the contract aren't clear at the 'signing'. I believe not all contracts have to be signed by both parties but in any contract both parties will have responsibilities. You will notice that the 'terms of the contract' with cart will have many conditions for you but disproportionately few for themselves. Their terms and conditions are not signed and are very weighted in their favour. Notice in the terms and conditions of the contract, there are a few for them and many for you. This is typical of this pretend free society we live in.
You don't buy a license then you don't go on the river 'owned' (ownership isn't what you think it is) by a group of people who are basically looking after it for the crown - exactly as you are when you buy land or land with a house on it. None of the people at cart actually have ownership of anything, and neither do you, they work for the Trust and the Trust - a manufactured idea - owns the land / river bed but really they only take responsibility to care for that land and it can't be sued for not carrying out it's responsibilities and nor can it campaign for a change in any law - bring in IWA and RYA and any of the other groups pretending to represent boaters.
Our 'society' is based on a Monarchy. The government was set up originally by the King / Queen to appease the 'peasants' (you and me) and prevent another peasants revolt which soon became the government 'of the people and for the people' at your expense but which very quickly became the government of a tiny group of people taking from the people and taking more and more. This group of people then grew, completely loosing touch with what it was originally intended for and began to boss the people around without any real benefit for the people but a great parasitic burden on them. I know this seems abstract but it is where we are and is often forgotten whilst focussing on this shit we think is our situation, now.
Do you have a mooring? Why do you have it? What benefits do you get from having one? Do you really need to be looking at what others are doing while you are getting your benefits? If you are in a situation you don't like, is it ok to point the finger at others to point out the fairness when really you should point the finger at yourself and ask why you accept your situation? Do you really like this restricted life you live in, in a cage, whether it is a boat cage or a house cage or a caravan cage really doesn't matter at all? Do you really think you are free? Do you really think you live in a free country? Is this all pretend? Who makes up the rules? Who decides on our fate? Who sends our family to war? Why are they in danger and what is the benefit? Do you think this same old shit is past it's sell by date and we should move on as a race of beings? Who and what are you? Do you know?