Let's say a DefaultTrust member has reached this status by collecting votes from his/her community but has bad intent and uses it to FUD/damage other projects, who and how can such a bad intent be stopped ?
Both DT1 and DT2 members need a net total of 0 or higher in terms of inclusions and exclusions from DT1 members to maintain their status on the default trust network. In other words, if more DT1 members exclude/distrust a user than include/trust a user, than that user will no longer be part of Default Trust.
If you think a Default Trust member is abusing their position by leaving multiple inappropriate ratings, start a thread about it in the
Reputation Board and present your evidence. If the evidence stands up to scrutiny, that member will likely rapidly be excluded from the Default Trust network.
Edit for clarity: Disagreeing with a single feedback a DT member has left is not the same as that DT member abusing their position. Simple disagreements are better solved via PMs.