What if fairlay includes the draft as official game time, just like the official cq esports site does.
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The draft phase is considered pre-match.  I've made hundreds of bets during the draft in the past and they've never tried these shenanigans on me before.
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When the official game time is 17:14 - 17:51 its obviously not considered "pre-match". Find a video with time stamp of the match so you can prove your point. I doubt they would screw you over for 250$.
Also, its a betting exchange, isnt it. So they dont even pay you with their money, another reason not to screw you.