> The first one will almost certainly be noticed, and will be clearly illegal/violate contracts, and can therefore be identified and rooted out.

Well since they have made very detailed public statements about the limits of this system and. not letting it be misused, they would certainly be in violation of contracts if they did start misusing it.

> if you used the same mechanisms (but different types of matches)

What kinds of ‘different matches’ do you think this mechanism can be used to make?