GPs point is that the technologies you've mentioned solved real problems before they were adapted for different use cases. They didn't make Darpanet and then think "man, if only there was some use for this" until the Internet came along. They designed it to send signals between distant nodes while being resilient to individual nodes being nuked.

Only after DARPAnet solved that problem did it get adapted to some other problems (ex: how do I send cat pictures to people)?