Not just secure private networks, but secure and programmable personal computing in general. The amount that I can actually do with my workstation PCs, let alone laptops or mobile phones, is now thoroughly restricted compared to problems that require a full-scale datacenter.

I originally enjoyed computing because, so to speak, it was an opportunity to own and craft my own tools, rather than being forced into the role of consuming someone else's pre-prepared product. Now we're being boxed into the consumer role in computing, too.