Emma,
So sorry to hear that you've had to deal with this.
I got my share of accusations of cheating, and nasty emails too, in previous Thons. I found they were much more frequent during the CAT than the SAT, one of the reasons that I chose not to "compete" this year.
At one point in the last CAT I got one so horrible that I temporarily resigned from the competition until my husband reminded me that I'm not a quitter, and convinced me to keep going!
Poor Ros, the GB-Gen Team Leader, must have been very confused to wake up to a 2am email saying I quit, and then an 8am email saying ...actually I don't.
Anyway, I know it's not much consolation, but hopefully it helps at least a little to know that you aren't alone.
Team Roses do so much great stuff on Wikitree, and I hope nobody gets put off continuing their good work because of this.
Enjoy your victory, and try not to let the unkindness of strangers sour it for you!