So what would be some good ways to distinguish a boat that might just be unsightly from one that is derelict and should be confiscated? That seems to be the tricky line to draw.
Is there a practical seaworthiness test? If so you might be able to identify bots that are more likely to sink and become a bigger public liability. That seems to be one of the objectives. But I can’t envision a practical assessment. I know some marinas stipulate that a bot must be operable and movable under its own power. So maybe require that the bot owner demonstrate this every 3 months or something like that?
A boat that is unoccupied for some period of time might be a test for abandonment. But how long, and how do you monitor? And how
much time does one need to spend on the boat to trigger abandonment?
Then there is the issue of essentially squatting on a public resource and making it your own. This is part of the problem with encampments on public lands, parks, etc. These resources are there for all of us to use, and not to the exclusion of others. So how long is too long to be anchored somewhere?
These are tough questions as you try to balance fairness, and draw lines between allowed use, vs abuse. Different authorities have tried various methods, so pretty good, and others pretty bad or with very undesirable side effects.