When in doubt: use Neutral.
I agree with this.
In your opinion should the negative tag remain or should I replace it with a neutral?
If you have to ask, I assume you're not absolutely sure, so it shouln't be negative.
It's also wise to ask yourself before leaving feedback: "Does my feedback make Bitcointalk a better place? And if it's negative: is it worth destroying someone's account and reputation over this?". Consider using Neutral feedback if neither Positive nor Negative is justified.
I seem to recall a discussion about this very topic when Yobit came back from their ban and hired a bunch of spammers to advertise their 10x
promotion scam. If I recall correctly the general consensus was that it was uncool to red-tag participants in the signature campaign. I don't know what changed, 1xbit is no more or less a scam than Yobit. Neither outfit has been able to attract quality participants, only sleepy alts and shitposters have applied. The managers of the campaigns don't seem to care if their signature is worn by red-tagged accounts, so there're no repercussions for the participants other than the tag itself, and most probably don't care since their using nearly worthless accounts that wouldn't qualify for any other signature campaigns anyway.
All this business of tagging participant of the 1xbit campaign seems like a grasp at straws to me. I get it, I'm tired of all the scams here also and if the forum refuses to ban scammers or their advertising campaigns, this seems like the only recourse we have.
But is it affective, or only leading to more drama? Maybe someone can enlighten me?