Japanese mobile users face an onslaught of aggressive ad networks and trackers. Current solutions are either too complex or not optimized for Japanese networks.
A minimal VPN app that specifically targets Japanese ad networks while maintaining speed. Focus on simplicity - one-toggle activation with smart defaults.
Monetize through a small monthly subscription. Japanese users pay for quality privacy tools, especially ones that solve local problems.
MVP could be a single iOS app using established ad-block lists for Japan. Biggest risk is Apple's changing policies around VPN-based ad blockers.