Foreign operators are mandated by the EU, they can't be banned. Spain has been one of the first countries to allow foreign high speed operators (unlike other European countries that did attempt to delay their entrance as much as possible

France, for example, has been trying to delay allowing Renfe (Spanish operator) to operate through the country as much as possible, while their public operator SNCF (branded as Ouigo) has been able to operate here since 2021.