Sounds like the state of Maine is asking for very nasty class action lawsuits, multiple restraining orders, etc. etc. etc. and an immense loss of revenue from 'the filthy rich' who would have traveled to Maine during the summer time.
I am (now was) planning to travel to the Canadian maritimes next summer .... I guess to avoid unnecessary hassles, Ill simply bypass Maine entirely.
One can only imagine, when long distance cruising, arriving in Maine, having the slobbering jack-booted 'revenuers' show up and demanding inane proofs of ownership, paid taxes, etc. Who in their RIGHT MIND carries such tax records when traveling?
Id also bet the farm that there will develop 'reciprocal' enforcements by other states where Maine citizens travel to, especially targeting 'revenue enforcement' on those Maine registered boats - as such insanity usually becomes duplicated and enhanced when there is any opportunity to gain 'revenue'. Maine has just announced to the world that there are many Maine boats that have probably not paid "their fair share" of sales taxes ..... an ample opportunity and 'probable cause' for other hungry for revenue states to investigate for the purposes of 'seeking revenue'.
Maine registered boats inevitably will become 'special revenue targets' when traveling to other states, just like boats registered in states that have NO or very little sales taxes, etc. on boats.