I. Introduction
Commercial cloud services are publicly available for more then 15 years already (if counting from AWS launch of S3 and EC2 at 2006). First cloud standards followed in 2010-2011 [1]. But the real point of no return was a COVID-2019 pandemic–remote and distributed work became a standard demanding IT solution to support [2]. Nearly at the same time first public 5G networks launched, and banks cloud migration trend arise [3].