Something existing for a long time increases the probability of it being stable, but does not guarantee it. It could be that Tether falls apart in a certain se

Something existing for a long time increases the probability of it being stable, but does not guarantee it. It could be that Tether falls apart in a certain set of conditions that just has not happened yet, such as FTX/Alameda being exposed by bad crypto conditions in 2022. It took Theranos 15 years to fall apart. For the majority of folks to be convinced, Tether both has to exist for a long while, and provide a basic level of introspection into how the reserves are handled.