No there will be no legal consequences. Bets from private persons to private persons are not accountable. There is no single case where any curt has seized someone's property due to a bet.
On a betting office you make a contract or buy a batch. That's a different thing.
I actually tend to agree that any liabilities arising from this bet are very likely worthless. It is what is been proposed in exchange for these "liabilities" that can lead to very serious and complex legal problems.
I tend to disagree again. This is solely a PR deal to minimize damage to the companies reputation.
Companies do this all the time to people wronged by one of their staff members.
But I'm not completely sure this time. Might be a problem, but I don't think so.
As long as Bittalk Media Ltd. does not in any way allow this to influence their relationship with Matt with respect to Matt's stock yes. Otherwise there can be serious problems.