I know no great detail of this scheme, but I think you can only get Tax Free plates if buying a new vehicle in their country, free of local tax - not bringing your own vehicle in or buying it from others, even somehow tax free. Tourists are allowed to use their own vehicles with their home registration without paying local taxes anyway.
I often see vehicles (cars, never motos) at the RUS border and along main routes away from borders, wearing these red/black German tax free plates - but they have had to deal with RUS Customs taxes on entry and are therefore only being driven temporarily 'in transit' to await their RUS plates.
Therefore they get to keep the Tax Free plates as souveniers- which answers your query.
But, anticipating possible thoughts, other countries Customs/Borders will be perfectly aware of what such plates mean and will not respect the continuing tax-free status after the dates imprinted on them.
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