Web Push Notifications 2026: Re-Engagement Lever or Nuisance That Kills Trust?
Web push has crossed three cycles since 2015: enthusiasm, fatigue, regulatory maturation. In 2026, it's a niche re-engagement lever delivering 2-5% additional revenue on cart abandonment, back in stock and price drop — or a nuisance destroying trust if poorly deployed. Web Push API, iOS PWA support, GDPR-compliant opt-in, OneSignal / PushOwl / Wonderpush comparison and ROI arithmetic.