Amazon ($AMZN) has moved to M365 in an “all-in” fashion just this year. Being maintained an old (2016?) on-premise exchange server and share-point installations

Amazon ($AMZN) has moved to M365 in an “all-in” fashion just this year. Being maintained an old (2016?) on-premise exchange server and share-point installations for 10 years… I wonder how it will fit with the “Frugality” LP.