Rare to see these kind of sites collaborate two different areas.I might consider on following this one.
Have you ever tried the platform? Can you tell us about the advantages of being P2P? I honestly don't think this system and decentralized betting is very possible. Many problems can arise and people who solve them may need to intervene in the system.
BetBTC was a popular exchange sometime back before they converted into a sportsbook while Fairlay remains the top crypto betting exchange with decent liquidity at present. exbet could compete with Fairlay primarily thanks to their design and UI(Seems to be better than Fairlay currently).