Regulatory Arbitrage and Infrastructure Vulnerability: How Divergent EU VAT/GST Policies on NFTs Influence the Prevalence of DNS Tunneling in Decentralized Exchanges

Abstract

The Court of Justice of the European Union's landmark ruling in Skatteverket v. David Hedqvist (Case C-264/14) established that Bitcoin-to-fiat exchanges constitute VAT-exempt services under Article 135(1)(e) of the VAT Directive, on the basis that Bitcoin serves as a contractual means of payment analogous to legal tender. However, the rapid proliferation of Non-Fungible Tokens (NFTs)-which are increasingly characterized as electronically supplied services (ESS) rather than currency-has fragmented the uniform fiscal landscape envisioned by the ruling. This paper examines a critical, underexplored nexus: whether divergent VAT/GST treatments of NFTs across EU Member States create incentives for regulatory arbitrage that systematically increases the cyber-risk profile of decentralized exchanges (DEXs). As recent incidents involving Aerodrome Finance, CoW Swap, and dYdX demonstrate, the decentralized finance (DeFi) sector remains acutely vulnerable to Domain Name System (DNS) hijacking attacks that exploit the Web2 front-end infrastructure upon which DEXs rely. The paper argues that when tax uncertainty drives platforms toward jurisdictional optimization-often involving complex routing, cross-border operations, and reliance on lessregulated infrastructure-they inadvertently expand their attack surface for adversarial DNS tunneling. Employing a socio-technical analysis that bridges fiscal harmonization and network security, this study proposes a harmonized VAT framework for NFTs to reduce the compliance-security paradox that currently incentivizes risk-increasing operational behaviors. It further recommends the integration of decentralized naming systems, such as the Ethereum Name Service (ENS), as a countermeasure to DNS-based exploitation. The findings contribute to both tax policy discourse and cybersecurity scholarship by demonstrating that fiscal harmonization is not merely an economic concern but a foundational component of DeFi infrastructure resilience.