Yeah this sort of feels like one half of an advert campaign. The 'build a need' part. Then a bit later we will get to see who is selling something that just happens to fix it. The links you gave are more for 'banks like to keep their stuff in house but we can keep it secure if you rent our machines'.
AWS heavy open source base: https://aws.amazon.com/financial-services/ Gcp, same story: https://cloud.google.com/solutions/financial-services