WORKING from home is not the same as being furloughed.
How does anyone think all the IT work that had to be done for all the businesses and organisations that still could operate was done when the people people had to stay well apart?
The insurance, legal, financial and educational work that continued, the local authority responsibilities for keeping communications with all workers going and fixing problems in housing, social work, roads, and bin collections, the coding checks on websites, the answering of online queries from anxious people about all kinds of medical and emotional problems that they didn't want to bother potentially over-worked GP's with, the keeping up-to-date of thousands - tens of thousands - of websites for the businesses now trading online instead of in person.
Many of these were things which had not previously been done from home, online. The software had to be found or written, the hardware bought, distributed, trained for, the whole thing kept operational and inexperienced operators supported while they grappled with unfamilar technology and concepts.
Grandad praises (rightly) the work of transport workers and other key workers in keeping the country supplied, nursed, transported and so on, but people in other industries where they were not visibly doing their work were also busy. As well as doing their jobs, a lot of them were also doing what amounted to the equivalent of the transport industry building new roads, designing trucks and rewriting the highway code.