Yes, Ryanair utilizes a random seat allocation policy for all passengers who choose not to pay a fee to reserve a specific seat. When you check in for your flight—which for free seats is only available between 24 hours and 2 hours before departure—the airline's algorithm assigns you a seat based on available inventory. Crucially, the system is notorious for separating travel companions; if you are on the same booking but do not pay for seats, it is highly likely you will be placed in different rows or even different ends of the plane. The only exception is for families traveling with children under 12; in this case, one adult is required to purchase a seat (for a small fee), and they are then allowed to reserve seats for up to four children for free to ensure the family sits together. For everyone else, the random allocation is a "take what you get" system designed to encourage passengers to pay the extra €8 to €25 for the peace of mind of choosing their own spot on the aircraft.