EU legislation harmonises the core authorisation regimes for payment and e-money institutions, investment firms and — under the Markets in Crypto-Assets Regulation (MiCA) — crypto-asset service providers and issuers. Authorisation is granted by a national competent authority, after which the firm can notify its intention to provide services in other member states.
Gambling is the notable exception: it is not harmonised at EU level, and each member state sets its own rules on whether and how online gaming may be offered to its residents.
The choice of home member state therefore matters. Supervisory approach, review timelines, language, local substance expectations and the banking ecosystem differ considerably between national authorities, even under the same legislation.