We are slowly but surely FORCED to use external/cloud services as Open (and even closed) source tools are no longer use-able on own/private infrastructures or need nuclear plan like budget and implementation time/ressources (Yes it is a bit exaggerated ;-) )
There are still people out there that do not want to force everyone in the US cloud, they work on development strategies to support and facilitate micro organisations. Fact will always be that micro organisations have much better client support/relationship and people are just sick of the monopolistic cloud providers. Which at that point do not have even a financial advantage any more. Software designs like eg dovecot will be phased out in the near future and replaced by modern applications, this will happen sooner than you think. I sincerely hope I can have a significant contribution in such transition.