From airline's standpoint it's logical - as some states and countries lift the lockdown order the flights might actually take place on normal schedule. From traveler's standpoint it's also rational - I get a full refund if United cancels the flight, but "store credit" if I cancel the trip on my own. I also get the same United voucher whether I cancel the trip a month in advance or 48 hours in advance.

This affects any lodging reservation in a negative way, though - what looks like a steady supply of bookings months out turns into a series of cancellations closer to the dates of the stay.