The 1xbit campaign manager has been less lenient in recent times and is only focusing on selecting participants without any negative feedback. Also, it seems like they are carefully paying participants based on their post quality.
Basically, a scam site like 1xbit isn't throwing away their money due to which their shills are working harder to defend them though it's all pointless in my opinion.
Once that participant accepted by the campaign manager then it is possibly get red tag by a DT. The campaign did mentioned that they only accept those who doesn't have negative trust and it is okay when that participant got red tag after joining the campaign. I would say it so myself that it's pointless to do it. No matter how many times they do it once a site's reputation goes bad it remains bad unless the matter is resolved.