This is all great for the percentage of people who can reasonably migrate to these systems, but I have a hard time imagining the information technology platforms of society at large adopting these systems …

Agreed - I think we need more tech-savvy people to adapt these systems and gradually improve them to the point that they are more accessible to the average person.

It’s not someting that free software folks are historically good at, so this definitely would not be an easy goal to achieve…

There are claims that regulations like GDPR disadvantages smaller players and actually help Facebook and Google, but it’s early days still – and maybe it makes it harder to compete with FB and Google on their own turf, but that’s a red herring and we should incubate business models that are more privacy-friendly to begin with?