I think you missed the point in that LCCs don’t generally offer transfer services. Two separate bookings and hope for the best, or via the other two that offers an insurance policy as such should things go south. By the time one adds baggage and everything else, for two bookings transfer, generally cheaper and safer to go via the other two.
Should they opt for the connection model, it’s gets very expensive if your dealing with displaced connecting traffic, and the next flight is in 3 or 4 days.