If FR don't allow some sort of changeability in tickets, there would be far fewer new bookings being made at the moment. Bookings made before 10 June are already paid - if they relax the terms now, then lots of people will defer their flights for summer 2020 to something in 2021 instead, leaving seats in S20 no longer generating revenue. Once an airline has your money, they will only relax the terms if they can't deliver their side of the contract. If they haven't got your money yet, then it is in the airline's interest to find the way to squeeze maximum revenue out of you - if that means relaxing the terms, then so be it
May not be nice, but I imagine right now FR are managing, to some extent around cashflow