Spain's Ministry of Social Rights and Consumer Affairs has launched a third investigation into the practices of tourist rental platforms.
The probe focuses on misleading advertising, where companies present themselves as private landlords to avoid legal obligations.
This practice has contributed to a housing crisis, with many properties leaving the long-term rental market for more profitable short-term tourist rentals.
Airbnb, a key player, faces a sanction for failing to remove thousands of non-compliant listings despite repeated warnings.
The platform argues it complies with regulations and plans to appeal.
Housing affordability remains a critical issue, especially for young Spaniards, who often spend up to 94% of their income on rent.
The government aims to curb speculative practices and protect consumers.