My car is paid for but I just don't display a license plate period (in my US state it's only a $10 fine to not).
Which of course draws a bunch attention to you regardless.
IIRC, Steve Jobs was known to do this in his black plateless Mercedes (decades ago).
I found it pretty grossly offensive a practice.
More onlookers (from behind) snap photos of this taglessness than any other politics/offensive bumper sticker I've had [2] — my only thought is that my vehicle misleads them to think that perhaps I'm undercover I.C.E. (purposefully obscurring)..?
[1] I've woken up blackout in a comped hotel when friends in identical situation got arrested/PI; I still carry a long-expired govt work badge in my moneyclip
[2] 2nd-most popular, all-time, was "Patron Saint of Denials Luigi Mangione" image
In Tennessee, after the first two citations for "improper display of registration" it becomes an actual crime (an actual misdemeanor); if I ever get to this point (four months now multiple cops behind me haven't given a single F), I have an increasingly-insane series of "protests" that have semi-interesting legalities [0].
[0] e.g. transfer registration to brother ($10 gift fee every few months, which results in no tag requirement); small 3ft trailer (possibly with guillotine erected atop, blocking view), as TN does not issue license plates to trailers less than 15ft length
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This isn't about "disappearing" (impossible in any modern civilization) — it's about sending a message and adding one small additional layer of protection from simple broad ALPR searches.
My vehicle blends in and is otherwise-legal — non-compliance encourages me to obey most traffic laws — but I do carry the plate in my passenger seat to display in event of pull-over (my plate is some iteration of "no plate," and I do respect individual officers' safeties [1]).
[1] They have every right to know, when performing a lawful investigation. My plan would be to hold it up while initially stopped (to show intent of identification, my plate is complicated in many ways and must be searched for in a very odd way).