It seems to me this is a case of a failed business plan where the income didn't exceed the expenses. The owner of the business examined his expenses and decided which of them he could most afford NOT to pay and the 'charity' CRT was on that list.
Despite failing to pay CRT his business model still wasn't a success. When notified by CRT he was required to move his vessel he decided the costs and risks involved weren't worth it.
My assumption is the owner doesn't have the money (or inclination) to want to take legal action against CRT for their actions in removing his vessel. However he's probably quite prepared for others to assume the burden of challenging CRT's actions, provided it's at no cost to himself.
I can imagine CRT officials deciding what to do with the boat. "George ring all the local potential mooring owner and ask them if they would accept a vessel we've seized because the owner hasn't paid us his mooring fees for the last year". [Later] "What do you mean, none of them are interested!" "Looks like we will have to find another suitable mooring location that we own". "But not too close or we'll find someone has moved it back during the night".
Meanwhile, there is already one former lightship for sale on the Gloucester & Sharpness Canal which would suggest the current local lightship market is saturated.