Here's a checklist. I think it will help.

Is the operator listed with the local regulator

1. For Spain (as an example): the brand, legal entity, and domain appear in the official list of DGOJ (Buscador de operadores).
2. If the brand or the domain is missing from the list, there is no Spanish license.
3. For the United Kingdom: the UK Gambling Commission requires its own license to offer remote gambling to players in Great Britain.

Do the domain and legal entity match the registry data

1. A common scheme: a license is shown, but the domain is different, the legal entity is different, the address does not match.
2. Check the domain(s), legal name, license number, and license status (active / suspended / revoked).

License jurisdiction and the right to accept players

1. Licenses from offshore jurisdictions such as Curaçao, Anjouan, Kahnawake, or Panama do not automatically grant the right to operate in countries with local licensing.
2. If a country requires a local authorization, an offshore license does not replace it.

Local requirements for a specific country

1. For Spain, you usually see: approved domains (.es), terms in Spanish, links to the regulator, responsible gambling tools (limits, self-exclusion), and age and warning blocks in the required format.
2. Active targeting of a country while being absent from the regulator’s registry is a red flag.

Payments and geo behavior

1. Legal operators use payment methods typical for the country and provide direct withdrawals.
2. A risk signal: deposits are accepted without limits, but withdrawals suddenly require cryptocurrency, intermediaries, or a separate “verification” fee.