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This should be a standard consumer protection law (right to repair), not a monopoly thing :/

EU consumer protection laws generally do not apply to B2B contracts (although member states can gold-plate them to extend their scope).

Sure, but that just means it needs to be adjusted to cover outright sabotage after sale like this.

More like highly criminal behaviour like fraud and extortion.

I don't see how it isn't literal fraud if the behavior isn't documented in the purchasing contracts.