Why Betfair Shows Different Odds Than Regular Bookmakers — Clear Guide for Irish Punters
https://www.web-bookmarks.win/are-bet365-s-responsible-gambling-tools-easy-to-use-or-hidden-a-6-point-deep-dive-for-irish-punters
Short version: Betfair is an exchange where real people set prices by offering to back or lay, while bookmakers set prices as a house and embed a margin. That difference creates the odd-looking prices you see. But the story is messier than that