In January 2020, Amazon changed the depreciation schedule for its server assets, from three years to four years. This accounting move was implemented because Amazon found that it was able to extend the useful life of its servers beyond three years. Moore's Law was waning and at Amazon's scale, it was able to serve a diverse set of use cases, thereby squeezing more value out of its EC2 assets for a longer period of time. Other hyperscalers followed suit and today, the big three all assume six year depreciation schedules for server assets.