https://www.valitsus.ee/en/news/gove...l-restrictions

I booked, it's only 16GBP return. In the worst case, I will lose 16GBP, or maybe get a 16GBP voucher I can use on another flight.

Free rebooking without paying the fare difference already worked for me in different circumstances - Ryanair advertised such free rebooking for tickets with travel dates between July-August (even if the original flight was not canceled). And indeed, I successfully rebooked a flight FRA-PMI-FRA to a later date without paying the fare difference, all travel dates (even with way higher prices) were available for free.