One of the reasons is that during the COVID affair, everyone wanted to (or was told to) stay home and use the internet to communicate and access computer systems at work.
I (ran the projects) put in our remote access systems AND the air-gapped facilities, beginning over 20 years ago. Every large infrastructure outfit I know of did the same long before 2020.
And a great deal else which should not be discussed.
This has been a very active area of IT system investment for decades, almost all of it in the private sector.