I think it's amazing the impact Pieter (and others) have had on solopreneurs and bootstrapped startups. He's become a reference point for what's possible when you release quickly (and publicly) and put your project front and centre in social media. Disrupting Agile by replacing weekly release procedures with several per day and broadcasting it all on Twitch. Disrupting customer interviews by talking to people directly on Twitter and getting feedback on features there and then.
Pieter's work is great because he applies everything that everyone says you should do but in the most simple and effective ways.