The Internet was concieved decades ago. In hindsight, many bad design choices were made. Given what was known at the time it's still blows my mind how well it has aged. There are some
Hypothetical scenario: what design choices would we change security wise if we had the opportunity to redesign the Internet from scratch today? Or to tackle the problem the other way around: what are the bad design choices for Internet security that we are stuck with today, unfixible without starting over?
Design the internet around principles of communication between people, based on choices everyone makes and can understand the implications of.
Given that the internet was meant and is designed as a means to surveil, sell, and act as a private means of production, there is no way to fix it without completely dismantling it and starting fresh.