Owning an aircraft in EASA land exposes the owner to the risk of unmonitored manufacturer directed costs in order to maintain the Airworthiness Certificate. This reduces government costs, but creates a situation in which the manufacturer can write law directing owners money its own way. And when that manufacturer goes out of business, the C of A effectively expires unless another private company picks it up.
But this can't be legal. I bet if you took this to the European court you'd have a pretty good chance of winning. A car manufacturer who tried the same trick, would be sued beyond oblivion if they tried the same ploy. Voiding your legal right of driving, making it uninsurable the day after your warranty expired unless you paid exorbitant sums to "comply" or bought a new one?