This is the name given to Ebikes that are massively over powered, slammed and stretched, REVSTA was first defined by famous underground Ebike builder Dennis Record of TORX powerbikes.
Powebikes are are being defined as very powerful Ebikes, with big motors and big batteries, designed specifically for mountainous terrain. They began to be defined in 2020 by a company called TORX.
Powerbikes are being defined as half dirt bike and half Ebike, but still have pedals.