South Africa’s Reserve Bank has frozen the bank accounts of Kastelo, a Cape Town-based crypto arbitrage fintech, over alleged exchange-control contraventions involving approximately R4 billion, roughly $246 million.

The Johannesburg High Court has twice refused to lift the freeze. And the case is now doing something that goes well beyond a single company’s legal troubles: it is forcing a continent-wide conversation about where crypto innovation ends and regulatory violation begins.

The allegations are serious and remain before the courts. Kastelo disputes them. But the legal record, the court judgments, and the regulatory questions the case raises deserve careful examination because the business model at the centre of this dispute is…