Fan Engagement Platform Market Size & Forecasts 2026-2035, By Segments (Platform Type, Interaction Frequency, Target Audience Size, Fan Involvement Level, End Use, Monetization Model, Engagement Type, Application), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (FanDuel, DraftKings, Bet365, 888 Holdings, William Hill)