https://www.theregister.co.uk/2018/06/04/data_integration_is_hard/

Data integration has been an IT challenge for decades. Long before cloud, even before client server. Back then, though, it was relatively simple – you were working with systems of record, desktop databases and business systems.

Today, it's not so simple. We exchange information about virtually everything from science to retail, from Facebook Likes to regional sales during August.