I've spoken to a couple of people who have proudly claimed to have spent ~3 months in one spot. In one case, opposite a water point (he was gloating at the fact that it was so convenient). So far, only seen this attitude on the K&A.
In other cases, CaRT allow continuous moorers due to circumstances. In one case a person had been, right next to but not blocking, the water point for years. This was allowed because they were/are an alcoholic slowly killing themselves (not sure if they're still alive, saw an ambulance visit them before moving on).
In both cases, there is an attitude that this is acceptable. In the first case people with no real reason to continuously moor have no shame about it, and it's hard to convince them otherwise because so many others think it's perfectly fine. In the second case, acceptance that the canals are an appropriate place for people with serious mental and physical health issues, because they're "cheaper".
I would like to see CaRT issue some strong communication to try and change people's minds for the first case. The second one is harder to address.