There's no need to wait for DT-members to do the dirty work.
The thing is, proof of transaction isn't enough to say they're alts, they can make an excuses if those accounts is his friend or made a deal of buy a digital goods etc. Moreover the @OP made this report without a proof of they're cheating in the same campaign. He's just think if there's any connection whether it's a transaction or somewhat are considered a worthy negative tag, but the truth is anyone can have multiple accounts as long as they're not doing a bad thing.
@OP it's better if you provide strong proof to consider those accounts were controlled by a same person, you can search his address and social media accounts, if you search those accounts using same address or social media accounts, then post it here. Also bring a proof of those accounts were cheated in the same campaign, if those 2 requirements you failed to met, you can't expect a negative tag from DT members.