I think Dartmouth explained it best.
““Optional” is not a trick word. It is not a wink that signals a continued institutional preference for the upcoming admissions cycle. This is not a moment for euphemisms or gimmicks; there should be no parsing of intent with this amended testing policy. It is a clear response to an unprecedented moment that requires admission officers to reimagine some of the elements we have historically required as we reassure anxious students about their upcoming applications. Worries about oversubscribed test sites, anxiety regarding limited registration access and the incongruity of test prep during a quarantine can be set aside.”